[PATCH] ipv6/route: Add a missing check on proc_dointvec

While flushing the cache via  ipv6_sysctl_rtcache_flush(), the call
to proc_dointvec() may fail. The fix adds a check that returns the
error, on failure.

Signed-off-by: Aditya Pakki <redacted>
---
 net/ipv6/route.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 059f0531f7c1..5ccdaa27ec53 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c

@@ -5053,12 +5053,16 @@ int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
 {
 	struct net *net;
 	int delay;
+	int ret;
 	if (!write)
 		return -EINVAL;
 
 	net = (struct net *)ctl->extra1;
 	delay = net->ipv6.sysctl.flush_delay;
-	proc_dointvec(ctl, write, buffer, lenp, ppos);
+	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+	if (ret)
+		return ret;
+
 	fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
 	return 0;
 }

-- 
2.17.1

From: Aditya Pakki <redacted>
Date: Mon, 24 Dec 2018 10:30:17 -0600

While flushing the cache via  ipv6_sysctl_rtcache_flush(), the call
to proc_dointvec() may fail. The fix adds a check that returns the
error, on failure.

Signed-off-by: Aditya Pakki <redacted>

Applied, but honestly running garbage collection even if the value
isn't change is completely harmless.