netdev - Re: [PATCH net-next] ipv6: add debug checks in fib6_info

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Message-ID: <590c27ae-c583-4404-ace7-ea68548d07a2@kernel.org>
Date: Thu, 7 Dec 2023 11:25:03 -0700
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, Kui-Feng Lee <sinquersw@...il.com>
Cc: patchwork-bot+netdevbpf@...nel.org, Kui-Feng Lee <thinker.li@...il.com>,
 davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
 netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next] ipv6: add debug checks in fib6_info_release()

On 12/7/23 11:22 AM, Eric Dumazet wrote:
> Feel free to amend the patch, but the issue is that we insert a fib
> gc_link to a list, then free the fi6 object without removing it first
> from the external list.

yes, move the insert down:

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b132feae3393..7257ba0e72b7 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3762,12 +3762,6 @@ static struct fib6_info
*ip6_route_info_create(struct fib6_config *cfg,
        if (cfg->fc_flags & RTF_ADDRCONF)
                rt->dst_nocount = true;

-       if (cfg->fc_flags & RTF_EXPIRES)
-               fib6_set_expires_locked(rt, jiffies +
-
clock_t_to_jiffies(cfg->fc_expires));
-       else
-               fib6_clean_expires_locked(rt);
-
        if (cfg->fc_protocol == RTPROT_UNSPEC)
                cfg->fc_protocol = RTPROT_BOOT;
        rt->fib6_protocol = cfg->fc_protocol;
@@ -3824,6 +3818,12 @@ static struct fib6_info
*ip6_route_info_create(struct fib6_config *cfg,
        } else
                rt->fib6_prefsrc.plen = 0;

+
+       if (cfg->fc_flags & RTF_EXPIRES)
+               fib6_set_expires_locked(rt, jiffies +
+
clock_t_to_jiffies(cfg->fc_expires));
+       else
+               fib6_clean_expires_locked(rt);
        return rt;
 out:
        fib6_info_release(rt);