linux-kernel - [PATCH v1] bcache: Check for NULL return of kzalloc()

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Message-Id: <1648114074-10045-1-git-send-email-unSimple1993@163.com>
Date:   Thu, 24 Mar 2022 17:27:54 +0800
From:   QintaoShen <unSimple1993@....com>
To:     colyli@...e.de
Cc:     linux-bcache@...r.kernel.org, kent.overstreet@...il.com,
        linux-kernel@...r.kernel.org, QintaoShen <unSimple1993@....com>
Subject: [PATCH v1] bcache: Check for NULL return of kzalloc()

kzalloc() is a memory allocation function which may return a NULL pointer.
Therefore, it is better to check the return value of kzalloc() to avoid potential
NULL-pointer dereference.

Signed-off-by: QintaoShen <unSimple1993@....com>
---
 drivers/md/bcache/request.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index fdd0194..232ffe3 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1105,6 +1105,9 @@ static void detached_dev_do_request(struct bcache_device *d, struct bio *bio,
 	 * which would call closure_get(&dc->disk.cl)
 	 */
 	ddip = kzalloc(sizeof(struct detached_dev_io_private), GFP_NOIO);
+	if (!ddpp)
+		return ;
+
 	ddip->d = d;
 	/* Count on the bcache device */
 	ddip->orig_bdev = orig_bdev;
-- 
2.7.4