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Date: Mon, 23 May 2022 11:24:37 +0800 From: liuyacan@...p.netease.com To: kgraul@...ux.ibm.com, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com Cc: linux-s390@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, ubraun@...ux.ibm.com, liuyacan <liuyacan@...p.netease.com> Subject: [PATCH net] net/smc: postpone sk_refcnt increment in connect() From: liuyacan <liuyacan@...p.netease.com> Same trigger condition as commit 86434744. When setsockopt runs in parallel to a connect(), and switch the socket into fallback mode. Then the sk_refcnt is incremented in smc_connect(), but its state stay in SMC_INIT (NOT SMC_ACTIVE). This cause the corresponding sk_refcnt decrement in __smc_release() will not be performed. Signed-off-by: liuyacan <liuyacan@...p.netease.com> Fixes: 86434744 ("net/smc: add fallback check to connect()") --- net/smc/af_smc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index fce16b9d6..45a24d242 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -1564,9 +1564,9 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr, if (rc && rc != -EINPROGRESS) goto out; - sock_hold(&smc->sk); /* sock put in passive closing */ if (smc->use_fallback) goto out; + sock_hold(&smc->sk); /* sock put in passive closing */ if (flags & O_NONBLOCK) { if (queue_work(smc_hs_wq, &smc->connect_work)) smc->connect_nonblock = 1; -- 2.20.1
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