4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pavel Tikhomirov <ptikhomi...@virtuozzo.com>


[ Upstream commit b007f09072ca8afa118ade333e717ba443e8d807 ]

> cat /proc/sys/net/ipv4/tcp_notsent_lowat
-1
> echo 4294967295 > /proc/sys/net/ipv4/tcp_notsent_lowat
-bash: echo: write error: Invalid argument
> echo -2147483648 > /proc/sys/net/ipv4/tcp_notsent_lowat
> cat /proc/sys/net/ipv4/tcp_notsent_lowat
-2147483648

but in documentation we have "tcp_notsent_lowat - UNSIGNED INTEGER"

v2: simplify to just proc_douintvec
Signed-off-by: Pavel Tikhomirov <ptikhomi...@virtuozzo.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv4/sysctl_net_ipv4.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -958,7 +958,7 @@ static struct ctl_table ipv4_net_table[]
                .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
                .maxlen         = sizeof(unsigned int),
                .mode           = 0644,
-               .proc_handler   = proc_dointvec,
+               .proc_handler   = proc_douintvec,
        },
 #ifdef CONFIG_IP_ROUTE_MULTIPATH
        {


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