Merge tag 'xfs-for-linus-v3.13-rc4' of git://oss.sgi.com/xfs/xfs

Pull xfs bugfixes from Ben Myers:

 - fix for buffer overrun in agfl with growfs on v4 superblock

 - return EINVAL if requested discard length is less than a block

 - fix possible memory corruption in xfs_attrlist_by_handle()

* tag 'xfs-for-linus-v3.13-rc4' of git://oss.sgi.com/xfs/xfs:
  xfs: growfs overruns AGFL buffer on V4 filesystems
  xfs: don't perform discard if the given range length is less than block size
  xfs: underflow bug in xfs_attrlist_by_handle()

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index e8fb1231db81..a7992f8de9d3 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -356,7 +356,8 @@ xfs_compat_attrlist_by_handle(
         if (copy_from_user(&al_hreq, arg,
                            sizeof(compat_xfs_fsop_attrlist_handlereq_t)))
                 return -XFS_ERROR(EFAULT);
-        if (al_hreq.buflen > XATTR_LIST_MAX)
+        if (al_hreq.buflen < sizeof(struct attrlist) ||
+            al_hreq.buflen > XATTR_LIST_MAX)
                 return -XFS_ERROR(EINVAL);
 
         /*