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xfs: fix acl count validation in xfs_acl_from_disk()

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Commit fa8b18ed didn't prevent the integer overflow and possible
memory corruption.  "count" can go negative and bypass the check.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Xi Wang 2011-12-12 21:55:52 +00:00 committed by Ben Myers
parent 687d1c5e8e
commit 093019cf1b
1 changed files with 1 additions and 1 deletions
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fs/xfs/xfs_acl.c
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@ -39,7 +39,7 @@ xfs_acl_from_disk(struct xfs_acl *aclp)
struct posix_acl_entry *acl_e;
struct posix_acl *acl;
struct xfs_acl_entry *ace;
int count, i;
unsigned int count, i;
count = be32_to_cpu(aclp->acl_cnt);
if (count > XFS_ACL_MAX_ENTRIES)