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Prevent OOB access on corrupted msdos directories.

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Submitted by:	Veo Zhang <veo live com>
MFC after:	2 weeks
This commit is contained in:
Xin LI 2017-11-30 08:28:17 +00:00
parent 3eba519845
commit aa031ef4a3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=326391
1 changed files with 1 additions and 1 deletions
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2
sbin/fsck_msdosfs/dir.c
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@ -621,7 +621,7 @@ readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
dirent.name[8] = '\0';
for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
dirent.name[k] = '\0';
if (dirent.name[k] != '\0')
if (k < 0 || dirent.name[k] != '\0')
k++;
if (dirent.name[0] == SLOT_E5)
dirent.name[0] = 0xe5;