From: Eric Dumazet <edumazet@google.com>
Date: Fri, 25 Mar 2022 09:50:21 -0700
Subject: net/smc: fix a memory leak in smc_sysctl_net_exit()
Patch-mainline: v5.18-rc1
Git-commit: 5ae6acf1d00be462d7b08b4a8748798ef595ae5a
References: jsc#PED-612

Recently added smc_sysctl_net_exit() forgot to free
the memory allocated from smc_sysctl_net_init()
for non initial network namespace.

Fixes: 462791bbfa35 ("net/smc: add sysctl interface for SMC")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Tony Lu <tonylu@linux.alibaba.com>
Cc: Dust Li <dust.li@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 net/smc/smc_sysctl.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/net/smc/smc_sysctl.c
+++ b/net/smc/smc_sysctl.c
@@ -61,5 +61,10 @@ err_alloc:
 
 void __net_exit smc_sysctl_net_exit(struct net *net)
 {
+	struct ctl_table *table;
+
+	table = net->smc.smc_hdr->ctl_table_arg;
 	unregister_net_sysctl_table(net->smc.smc_hdr);
+	if (!net_eq(net, &init_net))
+		kfree(table);
 }