iomap: iomap_bmap should check iomap_apply return value

Coverity caught this fairly minor bug, but we should check the return
value of iomap_apply regardless.

Coverity-id: 1437065
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/iomap/fiemap.c b/fs/iomap/fiemap.c
index 690ef2d..bccf305 100644 (file)
--- 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);