From fda21d46cce2879dbce981978f8cb07b36035369 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 5 Oct 2018 09:17:50 -0700 Subject: [PATCH] ipv6: do not leave garbage in rt->fib6_metrics In case ip_fib_metrics_init() returns an error, we better rewrite rt->fib6_metrics with &dst_default_metrics so that we do not crash later in ip_fib_metrics_put() Fixes: 767a2217533f ("net: common metrics init helper for FIB entries") Signed-off-by: Eric Dumazet Reported-by: syzbot Reviewed-by: David Ahern Signed-off-by: David S. Miller --- net/ipv6/route.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 6c1d817151ca..74d97addf1af 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -2976,6 +2976,8 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len); if (IS_ERR(rt->fib6_metrics)) { err = PTR_ERR(rt->fib6_metrics); + /* Do not leave garbage there. */ + rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; goto out; }