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authorGuo DaXing <guodaxing@huawei.com>2021-11-24 15:32:38 +0300
committerJakub Kicinski <kuba@kernel.org>2021-11-25 06:02:21 +0300
commit9ebb0c4b27a6158303b791b5b91e66d7665ee30e (patch)
tree4e0d554896333088331513eb44afea282b4992ab /net/smc
parent587acad41f1bc48e16f42bb2aca63bf323380be8 (diff)
downloadlinux-9ebb0c4b27a6158303b791b5b91e66d7665ee30e.tar.xz
net/smc: Fix loop in smc_listen
The kernel_listen function in smc_listen will fail when all the available ports are occupied. At this point smc->clcsock->sk->sk_data_ready has been changed to smc_clcsock_data_ready. When we call smc_listen again, now both smc->clcsock->sk->sk_data_ready and smc->clcsk_data_ready point to the smc_clcsock_data_ready function. The smc_clcsock_data_ready() function calls lsmc->clcsk_data_ready which now points to itself resulting in an infinite loop. This patch restores smc->clcsock->sk->sk_data_ready with the old value. Fixes: a60a2b1e0af1 ("net/smc: reduce active tcp_listen workers") Signed-off-by: Guo DaXing <guodaxing@huawei.com> Acked-by: Tony Lu <tonylu@linux.alibaba.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/smc')
-rw-r--r--net/smc/af_smc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 2692cba5a7b6..4b62c925a13e 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -2134,8 +2134,10 @@ static int smc_listen(struct socket *sock, int backlog)
smc->clcsock->sk->sk_user_data =
(void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
rc = kernel_listen(smc->clcsock, backlog);
- if (rc)
+ if (rc) {
+ smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
goto out;
+ }
sk->sk_max_ack_backlog = backlog;
sk->sk_ack_backlog = 0;
sk->sk_state = SMC_LISTEN;