From: Jakub Kicinski <kuba@kernel.org>
To: Hangbin Liu <liuhangbin@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Jiayuan Chen <jiayuan.chen@linux.dev>,
David Ahern <dsahern@gmail.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Fei Liu <feliu@redhat.com>
Subject: Re: [PATCH net v3] ipv6: fix data race in fib6_metric_set() using cmpxchg
Date: Wed, 1 Apr 2026 17:47:16 -0700 [thread overview]
Message-ID: <20260401174716.6b9fd993@kernel.org> (raw)
In-Reply-To: <20260331-b4-fib6_metric_set-kmemleak-v3-1-88d27f4d8825@gmail.com>
On Tue, 31 Mar 2026 12:17:18 +0800 Hangbin Liu wrote:
> - if (f6i->fib6_metrics == &dst_default_metrics) {
> + if (READ_ONCE(f6i->fib6_metrics) == &dst_default_metrics) {
> + struct dst_metrics *dflt = (struct dst_metrics *)&dst_default_metrics;
> struct dst_metrics *p = kzalloc_obj(*p, GFP_ATOMIC);
Orthogonal, but I forgot to reply - could you poke at making
cmpxchg() take const on the second argument? The type of the
first and third args must obviously match exactly but the
second one is just a reference, it should be okay to make
it const :/
next prev parent reply other threads:[~2026-04-02 0:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-31 4:17 [PATCH net v3] ipv6: fix data race in fib6_metric_set() using cmpxchg Hangbin Liu
2026-04-01 17:55 ` Eric Dumazet
2026-04-02 0:47 ` Jakub Kicinski [this message]
2026-04-02 0:50 ` patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260401174716.6b9fd993@kernel.org \
--to=kuba@kernel.org \
--cc=davem@davemloft.net \
--cc=dsahern@gmail.com \
--cc=dsahern@kernel.org \
--cc=edumazet@google.com \
--cc=feliu@redhat.com \
--cc=horms@kernel.org \
--cc=jiayuan.chen@linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=liuhangbin@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox