linux-kernel - [PATCH] md: bcache: io.c: fix a potential NULL pointer dereference

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Message-Id: <1369726275-5424-1-git-send-email-gmate.amit@gmail.com>
Date:	Tue, 28 May 2013 00:31:15 -0700
From:	Kumar Amit Mehta <gmate.amit@...il.com>
To:	koverstreet@...gle.com
Cc:	neilb@...e.de, linux-bcache@...r.kernel.org,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] md: bcache: io.c: fix a potential NULL pointer dereference

bio_alloc_bioset returns NULL on failure. This fix adds a missing check
for potential NULL pointer dereferencing.

Signed-off-by: Kumar Amit Mehta <gmate.amit@...il.com>
---
 drivers/md/bcache/io.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index 29f344b..4be2a07 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -98,6 +98,8 @@ struct bio *bch_bio_split(struct bio *bio, int sectors,
 
 	if (bio->bi_rw & REQ_DISCARD) {
 		ret = bio_alloc_bioset(gfp, 1, bs);
+		if (!ret)
+			return NULL;
 		idx = 0;
 		goto out;
 	}
-- 
1.7.10.4

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