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

[Aditya Pakki]

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 <pakki...@umn.edu>
---
 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