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 6AE8C3093DD; Mon, 13 Oct 2025 15:03:46 +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=1760367826; cv=none; b=sx00jmmAQS8MwRw6p5Qd89iKMxkqrdYriMjava9uTt6n2xQFIqp3D0E4w4fD1dP93KjY+ouYeJcmf9vHwlP3XT1jRwqOzlFJpB7QEaK91sLWBTNC9w5K6UZMwG6PO9W+Y3GtjPJReyBBFisJcoH6o5P/2iddxM357fYmOeXMWYA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760367826; c=relaxed/simple; bh=SewuOOZ2UnIp9qEe539bIv6sJjZgrwF8haygyXrT5zM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hwGIapB/nfybIrDdml7/e3e+0kHD3jtw0WOc9NTm4Fg4xdvBkKLIKXj5v33yQGEeQFvjcF//Oc63t/UqnXwD8sfNSBmkH1/5M7xJ6Fq+2hxO6LLDw4jbYqXkpFAqGnaWT5DdxaPrwHpr2p+Revf/JwHkPI5k2algv8X07/Xmdxs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vx1ZRHN+; 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="vx1ZRHN+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E951AC4CEE7; Mon, 13 Oct 2025 15:03:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760367826; bh=SewuOOZ2UnIp9qEe539bIv6sJjZgrwF8haygyXrT5zM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vx1ZRHN+ics5Y8f8Y+eU5i2RXfmVrDCSL0tRStdgVa2d+PUVWvBdTr9lrkCRYz0F6 CZOIpA0JM0Q/payuzURBk9iJQ3WjDbOXFCKebzLV21mmf+Cdwa3tCr7G09WydJuXLS HZHfAer0vXrY7l07sIY+lY0p20FUjOIvH9aJoqI4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michal Pecio , I Viswanath , Jakub Kicinski , Sasha Levin , syzbot+78cae3f37c62ad092caa@syzkaller.appspotmail.com Subject: [PATCH 6.6 148/196] net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast Date: Mon, 13 Oct 2025 16:45:39 +0200 Message-ID: <20251013144320.666086537@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013144315.184275491@linuxfoundation.org> References: <20251013144315.184275491@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: I Viswanath [ Upstream commit 958baf5eaee394e5fd976979b0791a875f14a179 ] syzbot reported WARNING in rtl8150_start_xmit/usb_submit_urb. This is the sequence of events that leads to the warning: rtl8150_start_xmit() { netif_stop_queue(); usb_submit_urb(dev->tx_urb); } rtl8150_set_multicast() { netif_stop_queue(); netif_wake_queue(); <-- wakes up TX queue before URB is done } rtl8150_start_xmit() { netif_stop_queue(); usb_submit_urb(dev->tx_urb); <-- double submission } rtl8150_set_multicast being the ndo_set_rx_mode callback should not be calling netif_stop_queue and notif_start_queue as these handle TX queue synchronization. The net core function dev_set_rx_mode handles the synchronization for rtl8150_set_multicast making it safe to remove these locks. Reported-and-tested-by: syzbot+78cae3f37c62ad092caa@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=78cae3f37c62ad092caa Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Tested-by: Michal Pecio Signed-off-by: I Viswanath Link: https://patch.msgid.link/20250924134350.264597-1-viswanathiyyappan@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/usb/rtl8150.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c index ddff6f19ff98e..92add3daadbb1 100644 --- a/drivers/net/usb/rtl8150.c +++ b/drivers/net/usb/rtl8150.c @@ -664,7 +664,6 @@ static void rtl8150_set_multicast(struct net_device *netdev) rtl8150_t *dev = netdev_priv(netdev); u16 rx_creg = 0x9e; - netif_stop_queue(netdev); if (netdev->flags & IFF_PROMISC) { rx_creg |= 0x0001; dev_info(&netdev->dev, "%s: promiscuous mode\n", netdev->name); @@ -678,7 +677,6 @@ static void rtl8150_set_multicast(struct net_device *netdev) rx_creg &= 0x00fc; } async_set_registers(dev, RCR, sizeof(rx_creg), rx_creg); - netif_wake_queue(netdev); } static netdev_tx_t rtl8150_start_xmit(struct sk_buff *skb, -- 2.51.0