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 1FE7226B09E; Thu, 13 Feb 2025 15:06:17 +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=1739459177; cv=none; b=eGVLJc6mFSMMRsBhPXMYJdEdjykqY+0LltToPHaZrkA7RPkAXccioRnG+4iJoze7d/eUkYowFpVJbd1RY2xJim048wx/E2sb17JNP9OltRQw7bmQdx37/iRq/vOi6GofPn3aSvCav+u6OVUerOA/q3M3eqtvPV2DjMroaP6LcZA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739459177; c=relaxed/simple; bh=ls+KgVfWpn1jaLwEks6M+iblKbU8/WUsQ0VYpcwJnl8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uM9rEAMekI9RFyvP35yjxSMXCOwJLUX1yHQd9DFeMe+58VyMOf1+CoahodepkEr2jWkehOIhSt0qn+oP3cjGDcUT1VAamfnModVebpKrzzfO487MHXqoFF+K+GLDbH03GVLoU3Xxp/tthEpGQPURXjnZdtsSROytH0a5LeRJvik= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=CF1XZ9k/; 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="CF1XZ9k/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78ADBC4CED1; Thu, 13 Feb 2025 15:06:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739459177; bh=ls+KgVfWpn1jaLwEks6M+iblKbU8/WUsQ0VYpcwJnl8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CF1XZ9k/EkbDmVEHlWV0qAuzK4cg/3kZt8LibFQf0Poo2PspS42gXBMG6QG4Yj3+6 I4ezrT/gL5GIO0TMeizP0+IXlpuiC/bzYxrneINnrGv3DXUkqgK5OC8iEmg3u6ihl4 O1zC8iG5QaIDQ/9gh7FCv8M2QPDhj8MR6EHkR0IE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Fedor Pchelkin , Kuniyuki Iwashima , Luiz Augusto von Dentz Subject: [PATCH 6.13 189/443] Bluetooth: L2CAP: handle NULL sock pointer in l2cap_sock_alloc Date: Thu, 13 Feb 2025 15:25:54 +0100 Message-ID: <20250213142447.906928949@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250213142440.609878115@linuxfoundation.org> References: <20250213142440.609878115@linuxfoundation.org> User-Agent: quilt/0.68 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 6.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Fedor Pchelkin commit 5f397409f8ee5bc82901eeaf799e1cbc4f8edcf1 upstream. A NULL sock pointer is passed into l2cap_sock_alloc() when it is called from l2cap_sock_new_connection_cb() and the error handling paths should also be aware of it. Seemingly a more elegant solution would be to swap bt_sock_alloc() and l2cap_chan_create() calls since they are not interdependent to that moment but then l2cap_chan_create() adds the soon to be deallocated and still dummy-initialized channel to the global list accessible by many L2CAP paths. The channel would be removed from the list in short period of time but be a bit more straight-forward here and just check for NULL instead of changing the order of function calls. Found by Linux Verification Center (linuxtesting.org) with SVACE static analysis tool. Fixes: 7c4f78cdb8e7 ("Bluetooth: L2CAP: do not leave dangling sk pointer on error in l2cap_sock_create()") Cc: stable@vger.kernel.org Signed-off-by: Fedor Pchelkin Reviewed-by: Kuniyuki Iwashima Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/l2cap_sock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -1888,7 +1888,8 @@ static struct sock *l2cap_sock_alloc(str chan = l2cap_chan_create(); if (!chan) { sk_free(sk); - sock->sk = NULL; + if (sock) + sock->sk = NULL; return NULL; }