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md: bcache: check the return value of kzalloc() in detached_dev_do_request()

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commit 40f567bbb3b0639d2ec7d1c6ad4b1b018f80cf19 upstream.

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

Fixes: bc082a55d2 ("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>
This commit is contained in:
Jia-Ju Bai
2022-05-27 23:28:18 +08:00
committed by Greg Kroah-Hartman
parent a67100f426
commit 47c1680e51
1 changed files with 6 additions and 0 deletions
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6
drivers/md/bcache/request.c
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@@ -1109,6 +1109,12 @@ static void detached_dev_do_request(struct bcache_device *d, struct bio *bio)
* which would call closure_get(&dc->disk.cl) * which would call closure_get(&dc->disk.cl)
*/ */
ddip = kzalloc(sizeof(struct detached_dev_io_private), GFP_NOIO); 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; ddip->d = d;
/* Count on the bcache device */ /* Count on the bcache device */
ddip->start_time = part_start_io_acct(d->disk, &ddip->part, bio); ddip->start_time = part_start_io_acct(d->disk, &ddip->part, bio);