[PATCH 5.10 452/452] md: bcache: check the return value of kzalloc() in detached_dev_do_request()

[Greg Kroah-Hartman]

From: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>

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@xxxxxxxxxxxxxxx>
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
Signed-off-by: Coly Li <colyli@xxxxxxx>
Link: https://lore.kernel.org/r/20220527152818.27545-4-colyli@xxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/md/bcache/request.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1109,6 +1109,12 @@ 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->start_time = part_start_io_acct(d->disk, &ddip->part, bio);