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net/smc: postpone sk_refcnt increment in connect()

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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.

Fixes: 86434744fe ("net/smc: add fallback check to connect()")
Signed-off-by: liuyacan <liuyacan@corp.netease.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
liuyacan 2022-05-23 12:57:07 +08:00 committed by David S. Miller
parent 0a3ad7d323
commit 75c1edf23b
1 changed files with 1 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
net/smc/af_smc.c
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@ -1564,9 +1564,9 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr,
if (rc && rc != -EINPROGRESS) if (rc && rc != -EINPROGRESS)
goto out; goto out;
sock_hold(&smc->sk); /* sock put in passive closing */
if (smc->use_fallback) if (smc->use_fallback)
goto out; goto out;
sock_hold(&smc->sk); /* sock put in passive closing */
if (flags & O_NONBLOCK) { if (flags & O_NONBLOCK) {
if (queue_work(smc_hs_wq, &smc->connect_work)) if (queue_work(smc_hs_wq, &smc->connect_work))
smc->connect_nonblock = 1; smc->connect_nonblock = 1;