[PATCH 4.9 117/271] tipc: set sysctl_tipc_rmem and named_timeout right range

[Greg Kroah-Hartman]

From: Jie Liu <liujie165@xxxxxxxxxx>

[ Upstream commit 4bcd4ec1017205644a2697bccbc3b5143f522f5f ]

We find that sysctl_tipc_rmem and named_timeout do not have the right minimum
setting. sysctl_tipc_rmem should be larger than zero, like sysctl_tcp_rmem.
And named_timeout as a timeout setting should be not less than zero.

Fixes: cc79dd1ba9c10 ("tipc: change socket buffer overflow control to respect sk_rcvbuf")
Fixes: a5325ae5b8bff ("tipc: add name distributor resiliency queue")
Signed-off-by: Jie Liu <liujie165@xxxxxxxxxx>
Reported-by: Qiang Ning <ningqiang1@xxxxxxxxxx>
Reviewed-by: Zhiqiang Liu <liuzhiqiang26@xxxxxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/tipc/sysctl.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/tipc/sysctl.c b/net/tipc/sysctl.c
index 1a779b1e85100..40f6d82083d7b 100644
--- a/net/tipc/sysctl.c
+++ b/net/tipc/sysctl.c
@@ -37,6 +37,8 @@
 
 #include <linux/sysctl.h>
 
+static int zero;
+static int one = 1;
 static struct ctl_table_header *tipc_ctl_hdr;
 
 static struct ctl_table tipc_table[] = {
@@ -45,14 +47,16 @@ static struct ctl_table tipc_table[] = {
 		.data		= &sysctl_tipc_rmem,
 		.maxlen		= sizeof(sysctl_tipc_rmem),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1         = &one,
 	},
 	{
 		.procname	= "named_timeout",
 		.data		= &sysctl_tipc_named_timeout,
 		.maxlen		= sizeof(sysctl_tipc_named_timeout),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1         = &zero,
 	},
 	{}
 };
-- 
2.20.1