[XFS] Catch errors returned from xfs_bmap_last_offset().

xfs_bmap_last_offset() can fail and return an error.
xfs_iomap_write_allocate() fails to detect and propagate the error.

SGI-PV: 980084
SGI-Modid: xfs-linux-melb:xfs-kern:30802a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index fde37f87d52f..fb3cf1191419 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -802,8 +802,11 @@ xfs_iomap_write_allocate(
                          */
                         nimaps = 1;
                         end_fsb = XFS_B_TO_FSB(mp, ip->i_size);
-                        xfs_bmap_last_offset(NULL, ip, &last_block,
-                                XFS_DATA_FORK);
+                        error = xfs_bmap_last_offset(NULL, ip, &last_block,
+                                                        XFS_DATA_FORK);
+                        if (error)
+                                goto trans_cancel;
+
                         last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
                         if ((map_start_fsb + count_fsb) > last_block) {
                                 count_fsb = last_block - map_start_fsb;