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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, TOTE Robot <oslab@tsinghua.edu.cn>,
        Jia-Ju Bai <baijiaju1990@gmail.com>, Coly Li <colyli@suse.de>,
        Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 5.18 877/879] md: bcache: check the return value of kzalloc() in detached_dev_do_request()
Date:   Tue,  7 Jun 2022 19:06:35 +0200
Message-Id: <20220607165028.313237677@linuxfoundation.org>
In-Reply-To: <20220607165002.659942637@linuxfoundation.org>
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From: Jia-Ju Bai <baijiaju1990@gmail.com>

commit 40f567bbb3b0639d2ec7d1c6ad4b1b018f80cf19 upstream.

The function kzalloc() in detached_dev_do_request() can fail, so its
return value should be checked.

Fixes: bc082a55d25c ("bcache: fix inaccurate io state for detached bcache devices")
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20220527152818.27545-4-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/md/bcache/request.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1105,6 +1105,12 @@ static void detached_dev_do_request(stru
 	 * which would call closure_get(&dc->disk.cl)
 	 */
 	ddip = kzalloc(sizeof(struct detached_dev_io_private), GFP_NOIO);
+	if (!ddip) {
+		bio->bi_status = BLK_STS_RESOURCE;
+		bio->bi_end_io(bio);
+		return;
+	}
+
 	ddip->d = d;
 	/* Count on the bcache device */
 	ddip->orig_bdev = orig_bdev;