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 0257C3016EE; Mon, 13 Apr 2026 16:21:13 +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=1776097273; cv=none; b=RFAGfYCAGqnniYz5Iqepkb+X7v2IoP5yZDhLTDZoN8pjanq9gYc48a8cmCMLYguU4rPGL81pWhROrWikV8fm9nskfTXUaR3OawNvnk7Z33wWA8c5RF4AZiOjNGtf1JdX13AjiFJWouT2qwqfoC0k+8oUR/G1B5KZl/mABR4AsSI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776097273; c=relaxed/simple; bh=VG6BtYzakPBS4cjf/crF5zkNrOUQn3fcelZ27j1fCxo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kc6aJcnKHZXIzzwCG93T9RfbCFxypwWqK64MX0lh4V3EGu39dKpiyTJm0TlBb49FVwMvjvl+53PACvDcjK9IPV0GJVdx4ysKY9U/JK72Cl9ywsHYf2iWEWFC5lPWGaMtOyutg1bCApDV0+w0JvUxnf4ldcD7db/h3z2FPFpvR8Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=avfGTrgD; 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="avfGTrgD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C816C2BCAF; Mon, 13 Apr 2026 16:21:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776097272; bh=VG6BtYzakPBS4cjf/crF5zkNrOUQn3fcelZ27j1fCxo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=avfGTrgD4i49lKyYSafb5xJqmk7NgPB9UpTWfmf/BeXSckXyh2ZfCU0siWNq1LKIh dPvdjt7P/BFwCIc2tDAiynUFXTJPK2IQbLEIkNVlpedoKsTA6KVDC5iVxDyvN5VAzJ lNunLXt3bQ81X2qbyUrf0H2UNmdf6bumSZ3Ceigk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+5b11eccc403dd1cea9f8@syzkaller.appspotmail.com, Oliver Hartkopp , Marc Kleine-Budde , Sasha Levin Subject: [PATCH 5.15 072/570] can: bcm: fix locking for bcm_op runtime updates Date: Mon, 13 Apr 2026 17:53:23 +0200 Message-ID: <20260413155833.139881134@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260413155830.386096114@linuxfoundation.org> References: <20260413155830.386096114@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Oliver Hartkopp [ Upstream commit c35636e91e392e1540949bbc67932167cb48bc3a ] Commit c2aba69d0c36 ("can: bcm: add locking for bcm_op runtime updates") added a locking for some variables that can be modified at runtime when updating the sending bcm_op with a new TX_SETUP command in bcm_tx_setup(). Usually the RX_SETUP only handles and filters incoming traffic with one exception: When the RX_RTR_FRAME flag is set a predefined CAN frame is sent when a specific RTR frame is received. Therefore the rx bcm_op uses bcm_can_tx() which uses the bcm_tx_lock that was only initialized in bcm_tx_setup(). Add the missing spin_lock_init() when allocating the bcm_op in bcm_rx_setup() to handle the RTR case properly. Fixes: c2aba69d0c36 ("can: bcm: add locking for bcm_op runtime updates") Reported-by: syzbot+5b11eccc403dd1cea9f8@syzkaller.appspotmail.com Closes: https://lore.kernel.org/linux-can/699466e4.a70a0220.2c38d7.00ff.GAE@google.com/ Signed-off-by: Oliver Hartkopp Link: https://patch.msgid.link/20260218-bcm_spin_lock_init-v1-1-592634c8a5b5@hartkopp.net Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- net/can/bcm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/can/bcm.c b/net/can/bcm.c index e2325f5ba7e54..c77d8bafde653 100644 --- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -1123,6 +1123,7 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, if (!op) return -ENOMEM; + spin_lock_init(&op->bcm_tx_lock); op->can_id = msg_head->can_id; op->nframes = msg_head->nframes; op->cfsiz = CFSIZ(msg_head->flags); -- 2.51.0