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Detect and handle invalid number of FATs

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If the number of FATs field in the boot sector is zero, give
an appropriate error code.

Obtained from:	Android 6c29bbe8d5%5E%21/
MFC after:	2 weeks
This commit is contained in:
delphij 2018-07-13 02:02:16 +00:00
parent 9a3371344f
commit 9131ba637f
1 changed files with 4 additions and 0 deletions
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4
sbin/fsck_msdosfs/boot.c
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@ -87,6 +87,10 @@ readboot(int dosfs, struct bootblock *boot)
pfatal("Invalid sector size: %u", boot->bpbBytesPerSec);
return FSFATAL;
}
if (boot->bpbFATs == 0) {
pfatal("Invalid number of FATs: %u", boot->bpbFATs);
return FSFATAL;
}
if (!boot->bpbRootDirEnts)
boot->flags |= FAT32;
if (boot->flags & FAT32) {