Btrfs: check return value of bio_alloc() properly

bio_alloc() has the possibility of returning NULL.
So, it is necessary to check the return value.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 59ec105444fe..4789770f8eaf 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2180,6 +2180,10 @@ static int bio_readpage_error(struct bio *failed_bio, struct page *page,
         }
 
         bio = bio_alloc(GFP_NOFS, 1);
+        if (!bio) {
+                free_io_failure(inode, failrec, 0);
+                return -EIO;
+        }
         bio->bi_private = state;
         bio->bi_end_io = failed_bio->bi_end_io;
         bio->bi_sector = failrec->logical >> 9;