From: Fernando Fernandez Mancera <fmancera@suse.de>
To: Wayen Yan <win847@gmail.com>
Cc: netdev@vger.kernel.org, lorenzo@kernel.org, horms@kernel.org,
pabeni@redhat.com, kuba@kernel.org, edumazet@google.com,
andrew+netdev@lunn.ch, angelogioacchino.delregno@collabora.com,
matthias.bgg@gmail.com, linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org
Subject: Re: [PATCH net-next] ipv6: initialize ipcm6_cookie before parsing control messages
Date: Tue, 21 Jul 2026 16:45:05 +0200 [thread overview]
Message-ID: <178464510579.7763.6518393222506443032.b4-review@b4> (raw)
In-Reply-To: <178358611790.128118.11036367713019213946@gmail.com>
On Thu, 09 Jul 2026 16:32:30 +0800, Wayen Yan <win847@gmail.com> wrote:
> ip6_datagram_send_ctl() parses both SOL_IPV6 and SOL_SOCKET control
> messages. For SOL_SOCKET messages it passes ipc6->sockc to
> __sock_cmsg_send(), which updates fields such as tsflags with
> read-modify-write operations.
>
> The IPV6_2292PKTOPTIONS and flowlabel option paths only set ipc6.opt
> before calling ip6_datagram_send_ctl(). If a SOL_SOCKET control message
> such as SO_TIMESTAMPING_* or SCM_TS_OPT_ID is present, this can read
> uninitialized sockc state.
>
> Initialize the ipcm6_cookie with ipcm6_init_sk(), as the normal IPv6
> sendmsg paths do, before overriding ->opt with the temporary option
> buffer.
>
> Signed-off-by: Wayen Yan <win847@gmail.com>
>
Reviewed-by: Fernando Fernandez Mancera <fmancera@suse.de>
Thanks!
next prev parent reply other threads:[~2026-07-21 14:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 8:32 [PATCH net-next] ipv6: initialize ipcm6_cookie before parsing control messages Wayen Yan
2026-07-21 14:45 ` Fernando Fernandez Mancera [this message]
2026-07-21 14:47 ` Fernando Fernandez Mancera
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