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>

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index ce8c15a7eabcccd8cf9231723119014a24dd885a..48786cdb5e6c8ccc9d94039d34432e8019c3d840 100644 (file)
--- 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;