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, 2 insertions, 0 deletions

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index d11afa67c7d..646f5e6f256 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -405,6 +405,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
                         bio_put(bio);
 
                         bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS);
+                        BUG_ON(!bio);
                         bio->bi_private = cb;
                         bio->bi_end_io = end_compressed_bio_write;
                         bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
@@ -687,6 +688,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 
                         comp_bio = compressed_bio_alloc(bdev, cur_disk_byte,
                                                         GFP_NOFS);
+                        BUG_ON(!comp_bio);
                         comp_bio->bi_private = cb;
                         comp_bio->bi_end_io = end_compressed_bio_read;