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authorChristoph Hellwig <hch@infradead.org>2011-12-06 16:21:05 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-12-09 08:52:46 -0800
commita980e5dccb3ff8cb8f77ff27264b13837958119d (patch)
tree2facb9fe2c6fb8f05031f50aa2abea10aeab61bd /fs/xfs
parentee6dfa64be0c1e8976f20246278121bc9fcf1a24 (diff)
xfs: validate acl count
commit fa8b18edd752a8b4e9d1ee2cd615b82c93cf8bba upstream. 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> Acked-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/linux-2.6/xfs_acl.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_acl.c b/fs/xfs/linux-2.6/xfs_acl.c
index 39f4f809bb68..4b9fb915d445 100644
--- a/fs/xfs/linux-2.6/xfs_acl.c
+++ b/fs/xfs/linux-2.6/xfs_acl.c
@@ -42,6 +42,8 @@ xfs_acl_from_disk(struct xfs_acl *aclp)
int count, i;
count = be32_to_cpu(aclp->acl_cnt);
+ if (count > XFS_ACL_MAX_ENTRIES)
+ return ERR_PTR(-EFSCORRUPTED);
acl = posix_acl_alloc(count, GFP_KERNEL);
if (!acl)