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xfs: validate acl count

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This prevents in-memory corruption and possible panics if the on-disk
ACL is badly corrupted.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-11-20 15:35:32 +00:00 committed by Ben Myers
parent c889132913
commit fa8b18edd7
1 changed files with 2 additions and 0 deletions
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fs/xfs/xfs_acl.c
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@ -42,6 +42,8 @@ xfs_acl_from_disk(struct xfs_acl *aclp)
int count, i; int count, i;
count = be32_to_cpu(aclp->acl_cnt); count = be32_to_cpu(aclp->acl_cnt);
if (count > XFS_ACL_MAX_ENTRIES)
return ERR_PTR(-EFSCORRUPTED);
acl = posix_acl_alloc(count, GFP_KERNEL); acl = posix_acl_alloc(count, GFP_KERNEL);
if (!acl) if (!acl)