xfs: improve the code that checks recovered extent-free intent items

The code that validates recovered extent-free intent items is kind of a
mess -- it doesn't use the standard xfs type validators, and it doesn't
check for things that it should.  Fix the validator function to use the
standard validation helpers and look for more types of obvious errors.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

1 files changed, 8 insertions, 8 deletions

diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c
index efafa311b2b6..3226714572b2 100644
--- a/fs/xfs/xfs_extfree_item.c
+++ b/fs/xfs/xfs_extfree_item.c
@@ -582,14 +582,14 @@ xfs_efi_validate_ext(
 	struct xfs_mount		*mp,
 	struct xfs_extent		*extp)
 {
-	xfs_fsblock_t			startblock_fsb;
-
-	startblock_fsb = XFS_BB_TO_FSB(mp,
-			   XFS_FSB_TO_DADDR(mp, extp->ext_start));
-	if (startblock_fsb == 0 ||
-	    extp->ext_len == 0 ||
-	    startblock_fsb >= mp->m_sb.sb_dblocks ||
-	    extp->ext_len >= mp->m_sb.sb_agblocks)
+	xfs_fsblock_t			end;
+
+	if (extp->ext_start + extp->ext_len <= extp->ext_start)
+		return false;
+
+	end = extp->ext_start + extp->ext_len - 1;
+	if (!xfs_verify_fsbno(mp, extp->ext_start) ||
+	    !xfs_verify_fsbno(mp, end))
 		return false;
 
 	return true;