nbd: Aovid double completion of a request
authorXie Yongji <xieyongji@bytedance.com>
Fri, 13 Aug 2021 15:13:30 +0000 (23:13 +0800)
committerJens Axboe <axboe@kernel.dk>
Fri, 13 Aug 2021 15:46:48 +0000 (09:46 -0600)
commitcddce01160582a5f52ada3da9626c052d852ec42
treee7615b6f592123a288f26ad9e64dd7381bafaf30
parent454bb6775202d94f0f489c4632efecdb62d3c904
nbd: Aovid double completion of a request

There is a race between iterating over requests in
nbd_clear_que() and completing requests in recv_work(),
which can lead to double completion of a request.

To fix it, flush the recv worker before iterating over
the requests and don't abort the completed request
while iterating.

Fixes: 96d97e17828f ("nbd: clear_sock on netlink disconnect")
Reported-by: Jiang Yadong <jiangyadong@bytedance.com>
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/20210813151330.96-1-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
drivers/block/nbd.c