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 2BB2C3FCB1E; Wed, 20 May 2026 18:23:56 +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=1779301437; cv=none; b=kd3KkXSjB24nvV5gqc338iH+LrQjvKEo16LwvUuJ9iHMYTxrdvUtGS7wkVBxUJbrS28Ux+TtZyOJ98ZDcUrbI0+JD3JHRs5H0QWUawdjFnqZfIuMMurzOgK7yniiMT1EicgdCBx/d4Ck3iynIB7iP+mgeYr7k1wHfROi8DLM3Zs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779301437; c=relaxed/simple; bh=PBYycczVWqznAEGxdSYHULjhg46aW3s1ZtspX3Mrp7A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GjhlGclcIDMsG4SWqvIwSinYUn2Bg26qx/T9wzCJGr7C3gcq+mhhUsUOQBQuM2U55zTw/dWs8N9oz5dbBRVr3KJfE1kVq43YzV0WFFpbnwmolE7t1nKoJRJAUnPnjgCyAP9LlAyi+QUSkFgbFbaP0a8Nx/QauekHQDP0+A5T2ek= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dH394VsF; 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="dH394VsF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 935B81F000E9; Wed, 20 May 2026 18:23:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779301436; bh=eYLEc6hkGSDYCZz3AmfsHFCvOq77YFn/iMh+D1cUXyw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dH394VsFgRPfuPb8IQC2rLZf6sKqOdGmLCq4bzYOuQocpu8rLxS8sAUIIj0WtLpRz JFfttruymbef3YQikem3iir63mfV2gJap5QS0frQhBu1YK3I7+MvhVRjNifl5evBCI kuqtGH0hrM+WosatrKhNoR6JkI+WT4o40brFcIVc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "William A. Kennington III" , Jeremy Kerr , Paolo Abeni , Sasha Levin Subject: [PATCH 6.12 553/666] net: mctp i2c: check length before marking flow active Date: Wed, 20 May 2026 18:22:44 +0200 Message-ID: <20260520162123.252575549@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162111.222830634@linuxfoundation.org> References: <20260520162111.222830634@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: William A. Kennington III [ Upstream commit 4ca07b9239bd0478ae586632a2ed72be37ed8407 ] Currently, mctp_i2c_get_tx_flow_state() is called before the packet length sanity check. This function marks a new flow as active in the MCTP core. If the sanity check fails, mctp_i2c_xmit() returns early without calling mctp_i2c_lock_nest(). This results in a mismatched locking state: the flow is active, but the I2C bus lock was never acquired for it. When the flow is later released, mctp_i2c_release_flow() will see the active state and queue an unlock marker. The TX thread will then decrement midev->i2c_lock_count from 0, causing it to underflow to -1. This underflow permanently breaks the driver's locking logic, allowing future transmissions to occur without holding the I2C bus lock, leading to bus collisions and potential hardware hangs. Move the mctp_i2c_get_tx_flow_state() call to after the length sanity check to ensure we only transition the flow state if we are actually going to proceed with the transmission and locking. Fixes: f5b8abf9fc3d ("mctp i2c: MCTP I2C binding driver") Signed-off-by: William A. Kennington III Acked-by: Jeremy Kerr Link: https://patch.msgid.link/20260423074741.201460-1-william@wkennington.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/mctp/mctp-i2c.c | 4 ++-- net/sched/cls_flower.c | 4 +++- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/mctp/mctp-i2c.c b/drivers/net/mctp/mctp-i2c.c index f8f83fe424e51..a939bc084fe8d 100644 --- a/drivers/net/mctp/mctp-i2c.c +++ b/drivers/net/mctp/mctp-i2c.c @@ -497,8 +497,6 @@ static void mctp_i2c_xmit(struct mctp_i2c_dev *midev, struct sk_buff *skb) u8 *pecp; int rc; - fs = mctp_i2c_get_tx_flow_state(midev, skb); - hdr = (void *)skb_mac_header(skb); /* Sanity check that packet contents matches skb length, * and can't exceed MCTP_I2C_BUFSZ @@ -510,6 +508,8 @@ static void mctp_i2c_xmit(struct mctp_i2c_dev *midev, struct sk_buff *skb) return; } + fs = mctp_i2c_get_tx_flow_state(midev, skb); + if (skb_tailroom(skb) >= 1) { /* Linear case with space, we can just append the PEC */ skb_put(skb, 1); diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c index 099ff6a3e1f51..f3af0ac892a86 100644 --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -560,6 +560,7 @@ static int __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f, struct netlink_ext_ack *extack) { struct cls_fl_head *head = fl_head_dereference(tp); + struct fl_flow_mask *mask; *last = false; @@ -576,11 +577,12 @@ static int __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f, list_del_rcu(&f->list); spin_unlock(&tp->lock); - *last = fl_mask_put(head, f->mask); + mask = f->mask; if (!tc_skip_hw(f->flags)) fl_hw_destroy_filter(tp, f, rtnl_held, extack); tcf_unbind_filter(tp, &f->res); __fl_put(f); + *last = fl_mask_put(head, mask); return 0; } -- 2.53.0