ext4: add check to io_submit_init_bio

The bio_alloc() function can return NULL if the memory allocation
fails.  So we need to check for this.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index ce8c15a7eabc..48786cdb5e6c 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -372,6 +372,8 @@ static int io_submit_init_bio(struct ext4_io_submit *io,
         struct bio *bio;
 
         bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES));
+        if (!bio)
+                return -ENOMEM;
         bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9);
         bio->bi_bdev = bh->b_bdev;
         bio->bi_end_io = ext4_end_bio;