diff options
| author | Ming Lei <ming.lei@redhat.com> | 2023-08-11 21:52:16 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-08-11 08:13:23 -0600 |
| commit | e24721e441a7c640e4e7b2b63c23c06d9a750880 (patch) | |
| tree | 5911a0eff83930b086aed0c8d0ba564dc4a2d9ff /drivers/block | |
| parent | 18267a0365d6ec8bbe85ba8cbea5af12d9e59610 (diff) | |
| download | linux-e24721e441a7c640e4e7b2b63c23c06d9a750880.tar.gz | |
ublk: fix 'warn: variable dereferenced before check 'req'' from Smatch
The added check of 'req_op(req) == REQ_OP_ZONE_APPEND' should have been
done after the request is confirmed as valid.
Actually here, the request should always been true, so add one
WARN_ON_ONCE(!req), meantime move the zone_append check after
checking the request.
Cc: Andreas Hindborg <a.hindborg@samsung.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: 29802d7ca33b ("ublk: enable zoned storage support")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230811135216.420404-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/ublk_drv.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 109a5b17537d2..e85e075b5bce1 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -1397,11 +1397,13 @@ static void ublk_commit_completion(struct ublk_device *ub, /* find the io request and complete */ req = blk_mq_tag_to_rq(ub->tag_set.tags[qid], tag); + if (WARN_ON_ONCE(unlikely(!req))) + return; if (req_op(req) == REQ_OP_ZONE_APPEND) req->__sector = ub_cmd->zone_append_lba; - if (req && likely(!blk_should_fake_timeout(req->q))) + if (likely(!blk_should_fake_timeout(req->q))) ublk_put_req_ref(ubq, req); } |