Bug Summary

File:src/sbin/fsck_ext2fs/setup.c
Warning:line 445, column 30
Array access (from variable 'cp') results in a null pointer dereference

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name setup.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/sbin/fsck_ext2fs/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/sbin/fsck_ext2fs/../fsck -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/sbin/fsck_ext2fs/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/sbin/fsck_ext2fs/setup.c
1/* $OpenBSD: setup.c,v 1.33 2019/07/01 07:13:44 kevlo Exp $ */
2/* $NetBSD: setup.c,v 1.1 1997/06/11 11:22:01 bouyer Exp $ */
3
4/*
5 * Copyright (c) 1997 Manuel Bouyer.
6 * Copyright (c) 1980, 1986, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#define DKTYPENAMES
35#include <sys/param.h> /* DEV_BSIZE roundup */
36#include <sys/time.h>
37#include <ufs/ext2fs/ext2fs_dinode.h>
38#include <ufs/ext2fs/ext2fs.h>
39#include <sys/stat.h>
40#include <sys/ioctl.h>
41#include <sys/dkio.h>
42#include <sys/disklabel.h>
43
44#include <errno(*__errno()).h>
45#include <fcntl.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <unistd.h>
49#include <string.h>
50#include <ctype.h>
51#include <err.h>
52
53#include "fsck.h"
54#include "extern.h"
55#include "fsutil.h"
56
57#define POWEROF2(num)(((num) & ((num) - 1)) == 0) (((num) & ((num) - 1)) == 0)
58
59void badsb(int, char *);
60int calcsb(char *, int, struct m_ext2fs *, struct disklabel *);
61static struct disklabel *getdisklabel(char *, int);
62static int readsb(int);
63
64int
65setup(char *dev)
66{
67 long cg, asked, i;
68 long bmapsize;
69 struct disklabel *lp;
70 off_t sizepb;
71 struct stat statb;
72 struct m_ext2fs proto;
73 int doskipclean;
74 u_int64_t maxfilesize;
75
76 havesb = 0;
77 fswritefd = -1;
78 doskipclean = skipclean;
79 if (stat(dev, &statb) == -1) {
1
Assuming the condition is false
→
2
←
Taking false branch
→
80 printf("Can't stat %s: %s\n", dev, strerror(errno(*__errno())));
81 return (0);
82 }
83 if (!S_ISCHR(statb.st_mode)((statb.st_mode & 0170000) == 0020000)) {
3
←
Assuming the condition is true
→
4
←
Taking false branch
→
84 pfatal("%s is not a character device", dev);
85 if (reply("CONTINUE") == 0)
86 return (0);
87 }
88 if ((fsreadfd = open(dev, O_RDONLY0x0000)) == -1) {
5
←
Assuming the condition is false
→
6
←
Taking false branch
→
89 printf("Can't open %s: %s\n", dev, strerror(errno(*__errno())));
90 return (0);
91 }
92 if (preen == 0)
7
←
Assuming 'preen' is not equal to 0
→
8
←
Taking false branch
→
93 printf("** %s", dev);
94 if (nflag || (fswritefd = open(dev, O_WRONLY0x0001)) == -1) {
9
←
Assuming 'nflag' is 0
→
10
←
Assuming the condition is false
→
11
←
Taking false branch
→
95 fswritefd = -1;
96 if (preen)
97 pfatal("NO WRITE ACCESS");
98 printf(" (NO WRITE)");
99 }
100 if (preen
11.1
'preen' is not equal to 0
 == 0)
12
←
Taking false branch
→
101 printf("\n");
102 fsmodified = 0;
103 lfdir = 0;
104 initbarea(&sblk)(&sblk)->b_dirty = 0; (&sblk)->b_bno = (daddr32_t
)-1; (&sblk)->b_flags = 0;;
105 initbarea(&asblk)(&asblk)->b_dirty = 0; (&asblk)->b_bno = (daddr32_t
)-1; (&asblk)->b_flags = 0;;
106 sblk.b_un.b_buf = malloc(SBSIZE1024);
107 asblk.b_un.b_buf = malloc(SBSIZE1024);
108 if (sblk.b_un.b_buf == NULL((void *)0) || asblk.b_un.b_buf == NULL((void *)0))
13
←
Assuming field 'b_buf' is not equal to NULL
→
14
←
Assuming field 'b_buf' is not equal to NULL
→
15
←
Taking false branch
→
109 errexit("cannot allocate space for superblock\n");
110 if ((lp = getdisklabel(NULL((void *)0), fsreadfd)) != NULL((void *)0))
16
←
Taking false branch
→
111 secsize = lp->d_secsize;
112 else
113 secsize = DEV_BSIZE(1 << 9);
114
115 if (!hotroot()) {
17
←
Assuming the condition is false
→
18
←
Taking false branch
→
116#ifndef SMALL
117 if (pledge("stdio getpw", NULL((void *)0)) == -1)
118 err(1, "pledge");
119#else
120 if (pledge("stdio", NULL((void *)0)) == -1)
121 err(1, "pledge");
122#endif
123 }
124
125 /*
126 * Read in the superblock, looking for alternates if necessary
127 */
128 if (readsb(1) == 0) {
19
←
Taking true branch
→
129 if (bflag || preen || calcsb(dev, fsreadfd, &proto, lp) == 0)
20
←
Assuming 'bflag' is 0
→
21
←
Assuming 'preen' is 0
→
22
←
Calling 'calcsb'
→
130 return(0);
131 if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
132 return (0);
133 for (cg = 1; cg < proto.e2fs_ncg; cg++) {
134 bflag = fsbtodb(&proto,((cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock) <<
(&proto)->e2fs_fsbtodb)
135 cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock)((cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock) <<
(&proto)->e2fs_fsbtodb);
136 if (readsb(0) != 0)
137 break;
138 }
139 if (cg >= proto.e2fs_ncg) {
140 printf("%s %s\n%s %s\n%s %s\n",
141 "SEARCH FOR ALTERNATE SUPER-BLOCK",
142 "FAILED. YOU MUST USE THE",
143 "-b OPTION TO FSCK_FFS TO SPECIFY THE",
144 "LOCATION OF AN ALTERNATE",
145 "SUPER-BLOCK TO SUPPLY NEEDED",
146 "INFORMATION; SEE fsck_ext2fs(8).");
147 return(0);
148 }
149 doskipclean = 0;
150 pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
151 }
152 if (debug)
153 printf("state = %d\n", sblock.e2fs.e2fs_state);
154 if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN0x01) {
155 if (doskipclean) {
156 pwarn("%sile system is clean; not checking\n",
157 preen ? "f" : "** F");
158 return (-1);
159 }
160 if (!preen)
161 pwarn("** File system is already clean\n");
162 }
163 maxfsblock = sblock.e2fs.e2fs_bcount;
164 maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg;
165 sizepb = sblock.e2fs_bsize;
166 maxfilesize = sblock.e2fs_bsize * NDADDR12 - 1;
167 for (i = 0; i < NIADDR3; i++) {
168 sizepb *= NINDIR(&sblock)((&sblock)->e2fs_bsize / sizeof(u_int32_t));
169 maxfilesize += sizepb;
170 }
171 /*
172 * Check and potentially fix certain fields in the super block.
173 */
174 if (/* (sblock.e2fs.e2fs_rbcount < 0) || */
175 (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) {
176 pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK",
177 sblock.e2fs.e2fs_rbcount);
178 if (reply("SET TO DEFAULT") == 1) {
179 sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1;
180 sbdirty()copyback_sb(&sblk); sblk.b_dirty = 1;
181 dirty(&asblk)(&asblk)->b_dirty = 1;
182 }
183 }
184 if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) {
185 pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK",
186 sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg);
187 return 0;
188 }
189 if (asblk.b_dirty && !bflag) {
190 copyback_sb(&asblk);
191 flush(fswritefd, &asblk);
192 }
193 /*
194 * read in the summary info.
195 */
196
197 sblock.e2fs_gd = calloc(sblock.e2fs_ngdb, sblock.e2fs_bsize);
198 if (sblock.e2fs_gd == NULL((void *)0))
199 errexit("out of memory\n");
200 asked = 0;
201 for (i=0; i < sblock.e2fs_ngdb; i++) {
202 if (bread(fsreadfd,(char *)
203 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)],
204 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1)((((sblock.e2fs_bsize>1024)?0:1)+i+1) << (&sblock
)->e2fs_fsbtodb),
205 sblock.e2fs_bsize) != 0 && !asked) {
206 pfatal("BAD SUMMARY INFORMATION");
207 if (reply("CONTINUE") == 0)
208 errexit("%s\n", "");
209 asked++;
210 }
211 }
212 /*
213 * allocate and initialize the necessary maps
214 */
215 bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t))(((((((maxfsblock) + ((8) - 1)) / (8)))+((sizeof(int16_t))-1)
)/(sizeof(int16_t)))*(sizeof(int16_t)));
216 blockmap = calloc((unsigned)bmapsize, sizeof (char));
217 if (blockmap == NULL((void *)0)) {
218 printf("cannot alloc %u bytes for blockmap\n",
219 (unsigned)bmapsize);
220 goto badsblabel;
221 }
222 statemap = calloc((unsigned)(maxino + 2), sizeof(char));
223 if (statemap == NULL((void *)0)) {
224 printf("cannot alloc %u bytes for statemap\n",
225 (unsigned)(maxino + 1));
226 goto badsblabel;
227 }
228 typemap = calloc((unsigned)(maxino + 1), sizeof(u_char));
229 if (typemap == NULL((void *)0)) {
230 printf("cannot alloc %u bytes for typemap\n",
231 (unsigned)(maxino + 1));
232 goto badsblabel;
233 }
234 lncntp = calloc((unsigned)(maxino + 1), sizeof(int16_t));
235 if (lncntp == NULL((void *)0)) {
236 printf("cannot alloc %u bytes for lncntp\n",
237 (unsigned)((maxino + 1) * sizeof(int16_t)));
238 goto badsblabel;
239 }
240 for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) {
241 numdirs += letoh16(sblock.e2fs_gd[cg].ext2bgd_ndirs)((__uint16_t)(sblock.e2fs_gd[cg].ext2bgd_ndirs));
242 }
243 inplast = 0;
244 listmax = numdirs + 10;
245 inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
246 inphead = calloc((unsigned)numdirs, sizeof(struct inoinfo *));
247 if (inpsort == NULL((void *)0) || inphead == NULL((void *)0)) {
248 printf("cannot alloc %u bytes for inphead\n",
249 (unsigned)(numdirs * sizeof(struct inoinfo *)));
250 goto badsblabel;
251 }
252 bufinit();
253 return (1);
254
255badsblabel:
256 ckfini(0);
257 return (0);
258}
259
260/*
261 * Read in the super block and its summary info.
262 */
263static int
264readsb(int listerr)
265{
266 daddr32_t super = bflag ? bflag : SBOFF((off_t)(((off_t)(0)) + 1024)) / DEV_BSIZE(1 << 9);
267
268 if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE1024) != 0)
269 return (0);
270 sblk.b_bno = super;
271 sblk.b_size = SBSIZE1024;
272
273 /* Copy the superblock in memory */
274 e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs)memcpy((&sblock.e2fs), (sblk.b_un.b_fs), 1024);;
275
276 /*
277 * run a few consistency checks of the super block
278 */
279 if (sblock.e2fs.e2fs_magic != E2FS_MAGIC0xef53) {
280 badsb(listerr, "MAGIC NUMBER WRONG"); return (0);
281 }
282 if (sblock.e2fs.e2fs_log_bsize > 2) {
283 badsb(listerr, "BAD LOG_BSIZE"); return (0);
284 }
285 if (sblock.e2fs.e2fs_bpg == 0) {
286 badsb(listerr, "BAD BLOCKS PER GROUP"); return (0);
287 }
288
289 /* compute the dynamic fields of the in-memory sb */
290 /* compute dynamic sb infos */
291 sblock.e2fs_ncg =
292 howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock,(((sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock) +
((sblock.e2fs.e2fs_bpg) - 1)) / (sblock.e2fs.e2fs_bpg))
293 sblock.e2fs.e2fs_bpg)(((sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock) +
((sblock.e2fs.e2fs_bpg) - 1)) / (sblock.e2fs.e2fs_bpg));
294 /* XXX assume hw bsize = 512 */
295 sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1;
296 sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize;
297 sblock.e2fs_bshift = LOG_MINBSIZE10 + sblock.e2fs.e2fs_log_bsize;
298 sblock.e2fs_qbmask = sblock.e2fs_bsize - 1;
299 sblock.e2fs_bmask = ~sblock.e2fs_qbmask;
300 sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg,(((sblock.e2fs_ncg) + ((sblock.e2fs_bsize / sizeof(struct ext2_gd
)) - 1)) / (sblock.e2fs_bsize / sizeof(struct ext2_gd)))
301 sblock.e2fs_bsize / sizeof(struct ext2_gd))(((sblock.e2fs_ncg) + ((sblock.e2fs_bsize / sizeof(struct ext2_gd
)) - 1)) / (sblock.e2fs_bsize / sizeof(struct ext2_gd)));
302 sblock.e2fs_ipb = sblock.e2fs_bsize / EXT2_DINODE_SIZE(&sblock)((&sblock)->e2fs.e2fs_rev > 0 ? (&sblock)->e2fs
.e2fs_inode_size : 128);
303 sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb;
304
305 /*
306 * Compute block size that the filesystem is based on,
307 * according to fsbtodb, and adjust superblock block number
308 * so we can tell if this is an alternate later.
309 */
310 sblk.b_bno = super / DEV_BSIZE(1 << 9);
311
312 if (sblock.e2fs_ncg == 1) {
313 /* no alternate superblock; assume it's okey */
314 havesb = 1;
315 return 1;
316 }
317
318 getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock,
319 (long)SBSIZE1024);
320 if (asblk.b_errs)
321 return (0);
322 if (bflag) {
323 havesb = 1;
324 return (1);
325 }
326
327 /*
328 * Set all possible fields that could differ, then do check
329 * of whole super block against an alternate super block.
330 * When an alternate super-block is specified this check is skipped.
331 */
332 asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount;
333 asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount;
334 asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount;
335 asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime;
336 asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime;
337 asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count;
338 asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count;
339 asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state;
340 asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh;
341 asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck;
342 asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv;
343 asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid;
344 asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid;
345 asblk.b_un.b_fs->e2fs_block_group_nr =
346 sblk.b_un.b_fs->e2fs_block_group_nr;
347 asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGE_FILE0x0002;
348 asblk.b_un.b_fs->e2fs_features_rocompat |=
349 sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGE_FILE0x0002;
350 if (sblock.e2fs.e2fs_rev > E2FS_REV00 &&
351 ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP(0x0002)) ||
352 (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP(0x0001 | 0x0002)))) {
353 if (debug) {
354 printf("compat 0x%08x, incompat 0x%08x, compat_ro "
355 "0x%08x\n",
356 sblock.e2fs.e2fs_features_compat,
357 sblock.e2fs.e2fs_features_incompat,
358 sblock.e2fs.e2fs_features_rocompat);
359 }
360 badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK");
361 return 0;
362 }
363 if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE1024)) {
364 if (debug) {
365 u_int32_t *nlp, *olp, *endlp;
366
367 printf("superblock mismatches\n");
368 nlp = (u_int32_t *)asblk.b_un.b_fs;
369 olp = (u_int32_t *)sblk.b_un.b_fs;
370 endlp = olp + (SBSIZE1024 / sizeof *olp);
371 for ( ; olp < endlp; olp++, nlp++) {
372 if (*olp == *nlp)
373 continue;
374 printf("offset %ld, original %ld, alternate %ld\n",
375 (long)(olp - (u_int32_t *)sblk.b_un.b_fs),
376 (long)letoh32(*olp)((__uint32_t)(*olp)),
377 (long)letoh32(*nlp)((__uint32_t)(*nlp)));
378 }
379 }
380 badsb(listerr,
381 "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
382 return (0);
383 }
384 havesb = 1;
385 return (1);
386}
387
388void
389copyback_sb(struct bufarea *bp)
390{
391 /* Copy the in-memory superblock back to buffer */
392 bp->b_un.b_fs->e2fs_icount = letoh32(sblock.e2fs.e2fs_icount)((__uint32_t)(sblock.e2fs.e2fs_icount));
393 bp->b_un.b_fs->e2fs_bcount = letoh32(sblock.e2fs.e2fs_bcount)((__uint32_t)(sblock.e2fs.e2fs_bcount));
394 bp->b_un.b_fs->e2fs_rbcount = letoh32(sblock.e2fs.e2fs_rbcount)((__uint32_t)(sblock.e2fs.e2fs_rbcount));
395 bp->b_un.b_fs->e2fs_fbcount = letoh32(sblock.e2fs.e2fs_fbcount)((__uint32_t)(sblock.e2fs.e2fs_fbcount));
396 bp->b_un.b_fs->e2fs_ficount = letoh32(sblock.e2fs.e2fs_ficount)((__uint32_t)(sblock.e2fs.e2fs_ficount));
397 bp->b_un.b_fs->e2fs_first_dblock =
398 letoh32(sblock.e2fs.e2fs_first_dblock)((__uint32_t)(sblock.e2fs.e2fs_first_dblock));
399 bp->b_un.b_fs->e2fs_log_bsize = letoh32(sblock.e2fs.e2fs_log_bsize)((__uint32_t)(sblock.e2fs.e2fs_log_bsize));
400 bp->b_un.b_fs->e2fs_log_fsize = letoh32(sblock.e2fs.e2fs_log_fsize)((__uint32_t)(sblock.e2fs.e2fs_log_fsize));
401 bp->b_un.b_fs->e2fs_bpg = letoh32(sblock.e2fs.e2fs_bpg)((__uint32_t)(sblock.e2fs.e2fs_bpg));
402 bp->b_un.b_fs->e2fs_fpg = letoh32(sblock.e2fs.e2fs_fpg)((__uint32_t)(sblock.e2fs.e2fs_fpg));
403 bp->b_un.b_fs->e2fs_ipg = letoh32(sblock.e2fs.e2fs_ipg)((__uint32_t)(sblock.e2fs.e2fs_ipg));
404 bp->b_un.b_fs->e2fs_mtime = letoh32(sblock.e2fs.e2fs_mtime)((__uint32_t)(sblock.e2fs.e2fs_mtime));
405 bp->b_un.b_fs->e2fs_wtime = letoh32(sblock.e2fs.e2fs_wtime)((__uint32_t)(sblock.e2fs.e2fs_wtime));
406 bp->b_un.b_fs->e2fs_lastfsck = letoh32(sblock.e2fs.e2fs_lastfsck)((__uint32_t)(sblock.e2fs.e2fs_lastfsck));
407 bp->b_un.b_fs->e2fs_fsckintv = letoh32(sblock.e2fs.e2fs_fsckintv)((__uint32_t)(sblock.e2fs.e2fs_fsckintv));
408 bp->b_un.b_fs->e2fs_creator = letoh32(sblock.e2fs.e2fs_creator)((__uint32_t)(sblock.e2fs.e2fs_creator));
409 bp->b_un.b_fs->e2fs_rev = letoh32(sblock.e2fs.e2fs_rev)((__uint32_t)(sblock.e2fs.e2fs_rev));
410 bp->b_un.b_fs->e2fs_mnt_count = letoh16(sblock.e2fs.e2fs_mnt_count)((__uint16_t)(sblock.e2fs.e2fs_mnt_count));
411 bp->b_un.b_fs->e2fs_max_mnt_count =
412 letoh16(sblock.e2fs.e2fs_max_mnt_count)((__uint16_t)(sblock.e2fs.e2fs_max_mnt_count));
413 bp->b_un.b_fs->e2fs_magic = letoh16(sblock.e2fs.e2fs_magic)((__uint16_t)(sblock.e2fs.e2fs_magic));
414 bp->b_un.b_fs->e2fs_state = letoh16(sblock.e2fs.e2fs_state)((__uint16_t)(sblock.e2fs.e2fs_state));
415 bp->b_un.b_fs->e2fs_beh = letoh16(sblock.e2fs.e2fs_beh)((__uint16_t)(sblock.e2fs.e2fs_beh));
416 bp->b_un.b_fs->e2fs_ruid = letoh16(sblock.e2fs.e2fs_ruid)((__uint16_t)(sblock.e2fs.e2fs_ruid));
417 bp->b_un.b_fs->e2fs_rgid = letoh16(sblock.e2fs.e2fs_rgid)((__uint16_t)(sblock.e2fs.e2fs_rgid));
418}
419
420void
421badsb(int listerr, char *s)
422{
423
424 if (!listerr)
425 return;
426 if (preen)
427 printf("%s: ", cdevname());
428 pfatal("BAD SUPER BLOCK: %s\n", s);
429}
430
431/*
432 * Calculate a prototype superblock based on information in the disk label.
433 * When done the cgsblock macro can be calculated and the fs_ncg field
434 * can be used. Do NOT attempt to use other macros without verifying that
435 * their needed information is available!
436 */
437int
438calcsb(char *dev, int devfd, struct m_ext2fs *fs, struct disklabel *lp)
439{
440 struct partition *pp;
441 char *cp;
442
443 cp = strchr(dev, '\0');
23
←
Value assigned to 'cp'
→
444 if ((cp == NULL((void *)0) || (cp[-1] < 'a' || cp[-1] >= 'a' + MAXPARTITIONS16)) &&
24
←
Assuming 'cp' is equal to NULL
→
445 !isdigit((unsigned char)cp[-1])) {
25
←
Array access (from variable 'cp') results in a null pointer dereference
446 pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
447 return (0);
448 }
449 cp--;
450 if (lp == NULL((void *)0))
451 pfatal("%s: CANNOT READ DISKLABEL\n", dev);
452 if (isdigit((unsigned char)*cp))
453 pp = &lp->d_partitions[0];
454 else
455 pp = &lp->d_partitions[*cp - 'a'];
456 if (pp->p_fstype != FS_EXT2FS17) {
457 pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n",
458 dev, pp->p_fstype < FSMAXTYPES(sizeof(fstypenames) / sizeof(fstypenames[0]) - 1) ?
459 fstypenames[pp->p_fstype] : "unknown");
460 return (0);
461 }
462 memset(fs, 0, sizeof(struct m_ext2fs));
463 fs->e2fs_bsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock)(((pp->p_fragblock) == 0 ? 0 : (1 << (((pp->p_fragblock
) & 0x07) - 1))) == 0 ? 0 : (((pp->p_fragblock) == 0 ?
0 : (1 << (((pp->p_fragblock) >> 3) + 12))) /
((pp->p_fragblock) == 0 ? 0 : (1 << (((pp->p_fragblock
) & 0x07) - 1))))); /* XXX */
464 if (fs->e2fs_bsize == 0) {
465 pfatal("%s: BLOCK SIZE DETERMINED TO BE ZERO\n", dev);
466 return (0);
467 }
468 fs->e2fs.e2fs_log_bsize = fs->e2fs_bsize / 1024;
469 fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE(1 << 9)) / fs->e2fs_bsize;
470 fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0;
471 fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY8;
472 fs->e2fs_bshift = LOG_MINBSIZE10 + fs->e2fs.e2fs_log_bsize;
473 fs->e2fs_qbmask = fs->e2fs_bsize - 1;
474 fs->e2fs_bmask = ~fs->e2fs_qbmask;
475 fs->e2fs_ncg =
476 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,(((fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock) +
((fs->e2fs.e2fs_bpg) - 1)) / (fs->e2fs.e2fs_bpg))
477 fs->e2fs.e2fs_bpg)(((fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock) +
((fs->e2fs.e2fs_bpg) - 1)) / (fs->e2fs.e2fs_bpg));
478 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
479 fs->e2fs_ngdb = howmany(fs->e2fs_ncg,(((fs->e2fs_ncg) + ((fs->e2fs_bsize / sizeof(struct ext2_gd
)) - 1)) / (fs->e2fs_bsize / sizeof(struct ext2_gd)))
480 fs->e2fs_bsize / sizeof(struct ext2_gd))(((fs->e2fs_ncg) + ((fs->e2fs_bsize / sizeof(struct ext2_gd
)) - 1)) / (fs->e2fs_bsize / sizeof(struct ext2_gd)));
481
482 return (1);
483}
484
485static struct disklabel *
486getdisklabel(char *s, int fd)
487{
488 static struct disklabel lab;
489
490 if (ioctl(fd, DIOCGDINFO((unsigned long)0x40000000 | ((sizeof(struct disklabel) &
0x1fff) << 16) | ((('d')) << 8) | ((101))), (char *)&lab) == -1) {
491 if (s == NULL((void *)0))
492 return (NULL((void *)0));
493 pwarn("ioctl (GCINFO): %s\n", strerror(errno(*__errno())));
494 errexit("%s: can't read disk label\n", s);
495 }
496 return (&lab);
497}
498
499daddr32_t
500cgoverhead(int c)
501{
502 int overh;
503 overh = 1 /* block bitmap */ +
504 1 /* inode bitmap */ +
505 sblock.e2fs_itpg;
506 if (sblock.e2fs.e2fs_rev > E2FS_REV00 &&
507 sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSE_SUPER0x0001) {
508 if (cg_has_sb(c) == 0)
509 return overh;
510 }
511 overh += 1 + sblock.e2fs_ngdb;
512 return overh;
513}