From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61DEE1849EE; Wed, 3 Jul 2024 11:20:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005647; cv=none; b=t0FZAVvPGox8Do5vZr2hubpusnkBfE9vppA5tCguKEEFJh0EeFLtTDC2EYtKmHc9IzNJvPus8AaXP/ju+7G1vLhkMYVRVA7PRE4ygvjGpKpyXKufcJKylppKzDqY9tjrOrSkH9txDor8pZ2eTf+j7NTn9pJrS9DytKvdRFzk1vs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005647; c=relaxed/simple; bh=RwxZS8c5yOuJ2qG3MOF4twBNNFjkrz/yLIyYYfUFts8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Kg7zs17o1cVchreKgXhAJvpMzUuXjZ38UqLuHXBlqDhfNUa6ZXAyyEDsM85FPxFlZojjDjuLf/fFNnMofe1iBbX/TgRVQakwdkHGLkB7FZ3/JjC+ldDmkozzo8vqPrFZowLfQc3e91d0fQ7Q5i1IsD8SURoOR+zE3jgkV3TEobw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZF5PERyI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ZF5PERyI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD607C2BD10; Wed, 3 Jul 2024 11:20:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720005647; bh=RwxZS8c5yOuJ2qG3MOF4twBNNFjkrz/yLIyYYfUFts8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZF5PERyIJTf9sjRV+jbnxanGQTUNx4CPk1O7D+7dKpLGbKMKAg/yhNWj29eiQBced gOJzuraGVkS6jaUc0qtU/fBgo5TeEI3sGbFYfz/E6gEpKyirxT9pnWMO6gJERL78sT 8FXay7RmqUENOWXQpEVTBFBBxwTvHymkvcYEYC7Y= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Petr Pavlu , David Ahern , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 108/356] net/ipv6: Fix the RT cache flush via sysctl using a previous delay Date: Wed, 3 Jul 2024 12:37:24 +0200 Message-ID: <20240703102917.186084544@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703102913.093882413@linuxfoundation.org> References: <20240703102913.093882413@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Petr Pavlu [ Upstream commit 14a20e5b4ad998793c5f43b0330d9e1388446cf3 ] The net.ipv6.route.flush system parameter takes a value which specifies a delay used during the flush operation for aging exception routes. The written value is however not used in the currently requested flush and instead utilized only in the next one. A problem is that ipv6_sysctl_rtcache_flush() first reads the old value of net->ipv6.sysctl.flush_delay into a local delay variable and then calls proc_dointvec() which actually updates the sysctl based on the provided input. Fix the problem by switching the order of the two operations. Fixes: 4990509f19e8 ("[NETNS][IPV6]: Make sysctls route per namespace.") Signed-off-by: Petr Pavlu Reviewed-by: David Ahern Link: https://lore.kernel.org/r/20240607112828.30285-1-petr.pavlu@suse.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv6/route.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 2c60270c5798b..0ca3da0999c6a 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -6346,12 +6346,12 @@ static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, if (!write) return -EINVAL; - net = (struct net *)ctl->extra1; - delay = net->ipv6.sysctl.flush_delay; ret = proc_dointvec(ctl, write, buffer, lenp, ppos); if (ret) return ret; + net = (struct net *)ctl->extra1; + delay = net->ipv6.sysctl.flush_delay; fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); return 0; } -- 2.43.0