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Fail to mount a device if the bytes per sector in the BPB is less than

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DEV_BSIZE or if the number of FAT sectors is zero.
This commit is contained in:
John Baldwin 2003-04-24 18:19:19 +00:00
parent 20350cadb9
commit 696f22f04f
1 changed files with 6 additions and 0 deletions
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6
sys/fs/msdosfs/msdosfs_vfsops.c
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@ -359,6 +359,10 @@ mountmsdosfs(devvp, mp, td, argp)
*/
SecPerClust = b50->bpbSecPerClust;
pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
if (pmp->pm_BytesPerSec < DEV_BSIZE) {
error = EINVAL;
goto error_exit;
}
pmp->pm_ResSectors = getushort(b50->bpbResSectors);
pmp->pm_FATs = b50->bpbFATs;
pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
@ -428,12 +432,14 @@ mountmsdosfs(devvp, mp, td, argp)
* - logical sector size: power of 2, >= block size
* - sectors per cluster: power of 2, >= 1
* - number of sectors: >= 1, <= size of partition
* - number of FAT sectors: >= 1
*/
if ( (SecPerClust == 0)
|| (SecPerClust & (SecPerClust - 1))
|| (pmp->pm_BytesPerSec < DEV_BSIZE)
|| (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
|| (pmp->pm_HugeSectors == 0)
|| (pmp->pm_FATsecs == 0)
) {
error = EINVAL;
goto error_exit;