xfs: add missing bmap cancel calls in error paths

If a failure occurs after the bmap free list is populated and before
xfs_bmap_finish() completes successfully (which returns a partial
list on failure), the bmap free list must be cancelled. Otherwise,
the extent items on the list are never freed and a memory leak
occurs.

Several random error paths throughout the code suffer this problem.
Fix these up such that xfs_bmap_cancel() is always called on error.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 73aab0d8d25ca..3bf4ad0d19e4f 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1474,7 +1474,7 @@ xfs_shift_file_space(
 				XFS_DIOSTRAT_SPACE_RES(mp, 0), 0,
 				XFS_QMOPT_RES_REGBLKS);
 		if (error)
-			goto out;
+			goto out_trans_cancel;
 
 		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 
@@ -1488,18 +1488,20 @@ xfs_shift_file_space(
 				&done, stop_fsb, &first_block, &free_list,
 				direction, XFS_BMAP_MAX_SHIFT_EXTENTS);
 		if (error)
-			goto out;
+			goto out_bmap_cancel;
 
 		error = xfs_bmap_finish(&tp, &free_list, &committed);
 		if (error)
-			goto out;
+			goto out_bmap_cancel;
 
 		error = xfs_trans_commit(tp);
 	}
 
 	return error;
 
-out:
+out_bmap_cancel:
+	xfs_bmap_cancel(&free_list);
+out_trans_cancel:
 	xfs_trans_cancel(tp);
 	return error;
 }