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xfs: Validate the length of on-disk ACLs

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In xfs_acl_from_disk, instead of trusting that xfs_acl.acl_cnt is correct,
make sure that the length of the attributes is correct as well.  Also, turn
the aclp parameter into a const pointer.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Andreas Gruenbacher
2015-11-03 12:41:59 +11:00
committed by Dave Chinner
parent 67d8e04e34
commit 86a21c7974
2 changed files with 14 additions and 7 deletions
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8
fs/xfs/libxfs/xfs_format.h
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@@ -1487,9 +1487,13 @@ struct xfs_acl {
sizeof(struct xfs_acl_entry) \
: 25)
#define XFS_ACL_MAX_SIZE(mp) \
#define XFS_ACL_SIZE(cnt) \
(sizeof(struct xfs_acl) + \
sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
sizeof(struct xfs_acl_entry) * cnt)
#define XFS_ACL_MAX_SIZE(mp) \
XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
/* On-disk XFS extended attribute names */
#define SGI_ACL_FILE "SGI_ACL_FILE"