From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 6 Jun 2013 14:18:22 +0000 (-0400)
Subject: ext4: add check to io_submit_init_bio
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a1d8d9a757cd46e044a3f6061c315eda14bf697e;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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 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;