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 7229E35AC3E; Tue, 16 Jun 2026 16:46:15 +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=1781628376; cv=none; b=Nw+Uy13a/oZw6jfMCC5IFAR4o3T/8V4RVnYCVG+ldeyZEYhMlyn6B8VUDpF8xCpE+g5+YpkkxpXHPYunYJiUh2sjWyJ7xWR3jWM/0j+JusLpfJuwvsYCiQxj1j0A2JCNfvkjWGRQfWQPFhVJ64hI/mj023nArrm7OYX4xzp8jks= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781628376; c=relaxed/simple; bh=c8ZR65HCrnGd4fyk3vaXuqE+bCRZr9qA1IO7XHk85Jk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=swcH/mpfnfEgqCtKBhDBSJHANNHWG2HPAmkgIfjeD6gq1/axqpanqtM+6wGVogGfwSfD6WMBGyHaPk/kC6K5YhsqGwhHi71Q98yJty/5Ll6ZEnEXqHBOowZvbIW84nA7I9ZyAL8PwJKvFNBxOp94AXLCDzZ5aDJ2fcCtTt7cI+w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AY0heq+/; 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="AY0heq+/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 755C81F00A3A; Tue, 16 Jun 2026 16:46:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781628375; bh=vPY06TTsJBu1WlEyDaShrCFdoLZw2QLMCu2RZaZqDbk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AY0heq+/LPxcbzi59ms89lI27yA4EPM/1MvFM7EiLD7mcOQJ+3jlAtaTdWwAkhnlz yirMv5NF0wOdBYL5I5eO90ByTpAn8qoGWxAD1Q9wemWNO4cmKCXUE/VZTAMsxdBN+6 /NUaB812in6eU+HdlUf02WI4Ox12czAzOE9+B9Sk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pooja Katiyar , Johan Hovold , stable , Heikki Krogerus Subject: [PATCH 6.6 084/452] usb: typec: ucsi: displayport: NAK DP_CMD_CONFIGURE without a payload VDO Date: Tue, 16 Jun 2026 20:25:11 +0530 Message-ID: <20260616145122.276625645@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145117.796205997@linuxfoundation.org> References: <20260616145117.796205997@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: Greg Kroah-Hartman commit 167dd8d12226587ee554f520aed0256b7769cd5d upstream. ucsi_displayport_vdm() handles a DP_CMD_CONFIGURE by copying the first payload VDO from data[], but unlike the equivalent handler in altmodes/displayport.c it does not check that count covers a VDO beyond the header. A header-only Configure VDM (count == 1) would read one u32 past the caller's array. In the normal UCSI path the caller controls count, so this is hardening for non-standard delivery paths. NAK and bail when no configuration VDO is present, matching the generic DP altmode driver's existing guard. Assisted-by: gkh_clanker_t1000 Cc: Pooja Katiyar Cc: Johan Hovold Cc: stable Reviewed-by: Heikki Krogerus Link: https://patch.msgid.link/2026051351-vividly-flattered-eb3d@gregkh Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/ucsi/displayport.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/usb/typec/ucsi/displayport.c +++ b/drivers/usb/typec/ucsi/displayport.c @@ -240,6 +240,10 @@ static int ucsi_displayport_vdm(struct t dp->header |= VDO_CMDT(CMDT_RSP_ACK); break; case DP_CMD_CONFIGURE: + if (count < 2) { + dp->header |= VDO_CMDT(CMDT_RSP_NAK); + break; + } dp->data.conf = *data; if (ucsi_displayport_configure(dp)) { dp->header |= VDO_CMDT(CMDT_RSP_NAK);