[PATCH] iomap: iomap_bmap should check iomap_apply return value

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Check the return value of iomap_apply and return 0 (i.e. error) if it
didn't succeed.

Coverity-id: 1437065
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/iomap/fiemap.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/iomap/fiemap.c b/fs/iomap/fiemap.c
index 690ef2d7c6c8..bccf305ea9ce 100644
--- a/fs/iomap/fiemap.c
+++ b/fs/iomap/fiemap.c
@@ -133,12 +133,16 @@ iomap_bmap(struct address_space *mapping, sector_t bno,
 	struct inode *inode = mapping->host;
 	loff_t pos = bno << inode->i_blkbits;
 	unsigned blocksize = i_blocksize(inode);
+	int ret;
 
 	if (filemap_write_and_wait(mapping))
 		return 0;
 
 	bno = 0;
-	iomap_apply(inode, pos, blocksize, 0, ops, &bno, iomap_bmap_actor);
+	ret = iomap_apply(inode, pos, blocksize, 0, ops, &bno,
+			  iomap_bmap_actor);
+	if (ret)
+		return 0;
 	return bno;
 }
 EXPORT_SYMBOL_GPL(iomap_bmap);