[PATCH net 2/4] net/smc: Fix smc_link->llc_testlink_time overflow

Tony Lu
2021-10-27T08:52:45Z

From: Tony Lu <tony.ly@linux.alibaba.com>

The value of llc_testlink_time is set to the value stored in
net->ipv4.sysctl_tcp_keepalive_time when linkgroup init. The value of
sysctl_tcp_keepalive_time is already jiffies, so we don't need to
multiply by HZ, which would cause smc_link->llc_testlink_time overflow,
and test_link send flood.

Fixes: 00a049cfde95 ("net/smc: move llc layer related init and clear into smc_llc.c")
Cc: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Tony Lu <tony.ly@linux.alibaba.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
---
net/smc/smc_llc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 72f4b72eb175..f1d323439a2a 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -1822,7 +1822,7 @@ void smc_llc_link_active(struct smc_link *link)
link->smcibdev->ibdev->name, link->ibport);
link->state = SMC_LNK_ACTIVE;
if (link->lgr->llc_testlink_time) {
- link->llc_testlink_time = link->lgr->llc_testlink_time * HZ;
+ link->llc_testlink_time = link->lgr->llc_testlink_time;
schedule_delayed_work(&link->llc_testlink_wrk,
link->llc_testlink_time);
}
--
2.19.1.6.gb485710b