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 41C361E25FA; Wed, 17 Sep 2025 12:57:53 +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=1758113873; cv=none; b=PexjAnbLYAFAAGeVA6Nsbgn9oBiT/0BNMGYvcOiRD0wWB3PvILqKQhvHWF1Fet8qPyDJu5h/XYmEZOScWUI03QDFwp04FdZK587nzQEiRzk52vNJ6FU+Aqpu1xqHQ+VIllZLPHBaNsfZnPABUZkaw/GC/v8sKeRY9S5usWiX7R0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758113873; c=relaxed/simple; bh=yVCTNqqfspwLUM5jIt4havyMb877ByibsfJDLyoBUqo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=p80dsWPeXn1uNayLMFfqg3Wy47wyJO2bS34ORdhl5wZJ9wUIl8qT3cw71TgrCMWSe00fXsRmqQqlxJ6PUBXp9yXOc/++7tPw/ENiywVZXE6mBWg/KCS0yAXm/kUqIELuEsz9/Q79CF/IG/7hFVgslpybwdLPPuCaVJZQplwDoHk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HRloIbt6; 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="HRloIbt6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A27A1C4CEF0; Wed, 17 Sep 2025 12:57:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758113873; bh=yVCTNqqfspwLUM5jIt4havyMb877ByibsfJDLyoBUqo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HRloIbt633EsJ1Ibi4eB/HJ6tOhWF7MMMwIGIDObiRK0vt69JPKSEOkC7GfCmfIhO gDyFjTT/E7V/6ooY+t7cJ90lUdVpMHInmMEBbhHwMFr1o5NGqN1lNRBnBERyj8yg+7 H8ovL5UtyMaZ/mlFTNUvzmUcoy139/oRYUl8k5LY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hangbin Liu , Simon Horman , Paolo Abeni , Sasha Levin Subject: [PATCH 6.6 080/101] hsr: use hsr_for_each_port_rtnl in hsr_port_get_hsr Date: Wed, 17 Sep 2025 14:35:03 +0200 Message-ID: <20250917123338.769254627@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250917123336.863698492@linuxfoundation.org> References: <20250917123336.863698492@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: Hangbin Liu [ Upstream commit 393c841fe4333cdd856d0ca37b066d72746cfaa6 ] hsr_port_get_hsr() iterates over ports using hsr_for_each_port(), but many of its callers do not hold the required RCU lock. Switch to hsr_for_each_port_rtnl(), since most callers already hold the rtnl lock. After review, all callers are covered by either the rtnl lock or the RCU lock, except hsr_dev_xmit(). Fix this by adding an RCU read lock there. Fixes: c5a759117210 ("net/hsr: Use list_head (and rcu) instead of array for slave devices.") Signed-off-by: Hangbin Liu Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250905091533.377443-3-liuhangbin@gmail.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/hsr/hsr_device.c | 3 +++ net/hsr/hsr_main.c | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c index a6fc3d7b02224..5514b5bedc929 100644 --- a/net/hsr/hsr_device.c +++ b/net/hsr/hsr_device.c @@ -228,6 +228,7 @@ static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) struct hsr_priv *hsr = netdev_priv(dev); struct hsr_port *master; + rcu_read_lock(); master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); if (master) { skb->dev = master->dev; @@ -240,6 +241,8 @@ static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) dev_core_stats_tx_dropped_inc(dev); dev_kfree_skb_any(skb); } + rcu_read_unlock(); + return NETDEV_TX_OK; } diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c index c325ddad539a7..76a1958609e29 100644 --- a/net/hsr/hsr_main.c +++ b/net/hsr/hsr_main.c @@ -125,7 +125,7 @@ struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt) { struct hsr_port *port; - hsr_for_each_port(hsr, port) + hsr_for_each_port_rtnl(hsr, port) if (port->type == pt) return port; return NULL; -- 2.51.0