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xfs: validate acl count
author
Christoph Hellwig
<hch@infradead.org>
Sun, 20 Nov 2011 15:35:32 +0000
(15:35 +0000)
committer
Ben Myers
<bpm@sgi.com>
Tue, 29 Nov 2011 04:14:24 +0000
(22:14 -0600)
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>
fs/xfs/xfs_acl.c
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diff --git
a/fs/xfs/xfs_acl.c
b/fs/xfs/xfs_acl.c
index
b6c4b37
..
76e4266
100644
(file)
--- a/
fs/xfs/xfs_acl.c
+++ b/
fs/xfs/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)