From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 079253A254B; Thu, 2 Jul 2026 16:49:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783010972; cv=none; b=nifaSreBWAiGX8XTXxPPXA1qPlh7gEHHrMgvrc2jTS9RBP1xoKq9CqDaVHDBUswn0czj6FTpNoMg+TBA2zvi/Ek6n9UQH9wq/w/yIdV2mHw8SLD3UWahXy1LdURXGDxZ13NpV7KO0Mux1AMzTTodomXduPHSbgnyV4asN1cXv5Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783010972; c=relaxed/simple; bh=J0KEvB8YN/Zj7g9FbfMn81B1Hpudyh7vDSBSKW0JuzE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IBy8JkwpalX5WRpDbgFiOYxamyJ9goewZdol0d2Gzn6TjMRQv282+PxRWcRiZv4wJ4kCnClzaJGmJGtBtwv3nc2e7K48GvTM+hakZ3ZJwBgxFSXRvqCa63ebfNCYlTHdYypoZAHLZl0LQqWMobkbqGZUOWXYOvnZyt/1DhSquHI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=w8LX9mE2; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="w8LX9mE2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6E5561F000E9; Thu, 2 Jul 2026 16:49:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1783010970; bh=T70t37BlW6Miv7LyHF0xk9Z+JbmkfJbRTE3l1KpCeRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=w8LX9mE252AZ+cR8DdLRXCZ/poWWJXdxsa49xIG1O8fd07wJ2J25bCtNyYlrN/034 lwnuvhXExF6V4iI5H0r/ve3CH61rtTGcMuMTvWkaDYiVuw6lusouABakbhoX2q5NC6 1Q45A1v7f3ACzE8DXmy2FstfBRSlTYllewkfidbc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable@kernel.org, Sven Eckelmann , Sasha Levin Subject: [PATCH 6.6 108/175] batman-adv: tp_meter: annotate last_recv_time access with READ/WRITE_ONCE Date: Thu, 2 Jul 2026 18:20:09 +0200 Message-ID: <20260702155118.038317721@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260702155115.766838875@linuxfoundation.org> References: <20260702155115.766838875@linuxfoundation.org> User-Agent: quilt/0.69 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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sven Eckelmann commit d67c728f07fca2ee6ffdc6dd4421cf2e8691f4d1 upstream. The last_recv_time field for batadv_tp_receiver tracks the jiffies value of the most recent activity and is used to detect timeouts. These accesses are not consistently protected by a lock, so READ_ONCE/WRITE_ONCE must be used to prevent data races caused by compiler optimizations. Cc: stable@kernel.org Fixes: 33a3bb4a3345 ("batman-adv: throughput meter implementation") Signed-off-by: Sven Eckelmann Signed-off-by: Sasha Levin --- net/batman-adv/tp_meter.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c index 638dd438a6c052..b882919a868ca0 100644 --- a/net/batman-adv/tp_meter.c +++ b/net/batman-adv/tp_meter.c @@ -1183,7 +1183,7 @@ static void batadv_tp_receiver_shutdown(struct timer_list *t) bat_priv = tp_vars->bat_priv; /* if there is recent activity rearm the timer */ - if (!batadv_has_timed_out(tp_vars->last_recv_time, + if (!batadv_has_timed_out(READ_ONCE(tp_vars->last_recv_time), BATADV_TP_RECV_TIMEOUT)) { /* reset the receiver shutdown timer */ batadv_tp_reset_receiver_timer(tp_vars); @@ -1424,7 +1424,7 @@ batadv_tp_init_recv(struct batadv_priv *bat_priv, tp_vars = batadv_tp_list_find_session(bat_priv, icmp->orig, icmp->session, BATADV_TP_RECEIVER); if (tp_vars) { - tp_vars->last_recv_time = jiffies; + WRITE_ONCE(tp_vars->last_recv_time, jiffies); goto out_unlock; } @@ -1455,7 +1455,7 @@ batadv_tp_init_recv(struct batadv_priv *bat_priv, kref_get(&tp_vars->refcount); timer_setup(&tp_vars->timer, batadv_tp_receiver_shutdown, 0); - tp_vars->last_recv_time = jiffies; + WRITE_ONCE(tp_vars->last_recv_time, jiffies); kref_get(&tp_vars->refcount); hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list); @@ -1506,7 +1506,7 @@ static void batadv_tp_recv_msg(struct batadv_priv *bat_priv, goto out; } - tp_vars->last_recv_time = jiffies; + WRITE_ONCE(tp_vars->last_recv_time, jiffies); } /* if the packet is a duplicate, it may be the case that an ACK has been -- 2.53.0