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 <pakki001@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 194bc162866d..a94e0b02a8ac 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -5054,12 +5054,16 @@ 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;
 }