From: Eric W. Biederman <ebiederm@xmission.com>
Date: Wed, 13 May 2009 16:58:17 +0000 (+0000)
Subject: net: FIX ipv6_forward sysctl restart
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5007392d8512e666107dc356d4c2e05627b9029b;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

net: FIX ipv6_forward sysctl restart

Just returning -ERESTARTSYS without a signal pending is not
good that will just leak it to userspace.  We need return
-ERESTARTNOINTR so we always restart and set signal pending
so that we fall of the fast path of syscall return and setup
the system call restart.

So use restart_syscall() which does all of this for us.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a8218bc1806a..9eb61c7cae57 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -503,7 +503,7 @@ static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 		return 0;
 
 	if (!rtnl_trylock())
-		return -ERESTARTSYS;
+		return restart_syscall();
 
 	if (p == &net->ipv6.devconf_all->forwarding) {
 		__s32 newf = net->ipv6.devconf_all->forwarding;