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 6619D380FC7; Thu, 20 Aug 2026 15:23:31 +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=1787239412; cv=none; b=fSd3FWlkaOOq9tZn92/MkMlpVrGOh5F8fNymoy67WLH+RC6rzX741OvaYiws/tXVQeuEx/3mFZLsss/gDsldcZGMuv7yTSlDJcYt9GvsVUjcTPwCW5RhgqYRuwzXiYgUTp5hvb0T9Yu7mPhcVnezMpPTfUlolru3keLBIDgUmX8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787239412; c=relaxed/simple; bh=Iuuw/AeE2e4K9JGG90mmWAgxMvPFmf5nUSS6B56A5Gc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XoyyBzBYiafW3CMJoxUl19U05izEtsbvlmzOb6hj8oVKDFfBB4Gm/ltaslm6oF9C3oqHc8suRxj2QN8MuVjvAvubca2VmdFtKYyVM0xGvD3C9Hnk+6DErxtNr1mTw1RUV3TMuqvlmvDK7NsIp/nJa7AZtK0OG+FJDrl9NhK0Tm0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gZDksQ2i; 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="gZDksQ2i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C13041F000E9; Thu, 20 Aug 2026 15:23:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787239411; bh=mo8zmAhmXMx+ZqCyCGTmC0rLpdg7p2+Lo+3TRGFvZ+o=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=gZDksQ2ix5PvQd2N4525waomxZQU0cDveh+gv2EZ0/8TxTgsy1FnPRU8iT5xghqRt SbxLKvW24WFEUcv6lvikaAbQNC7q+FOJbcAhp7WyOznXu+mU2lAx4DT5DC9ljzrUAW BizXouTTeCHQTrvEEcO2+rrlubWq53SML+zsjoxc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Richard Davies , Dmitry Torokhov Subject: [PATCH 6.12 040/220] Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet Date: Thu, 20 Aug 2026 16:53:50 +0200 Message-ID: <20260820145224.700331343@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820145223.480031205@linuxfoundation.org> References: <20260820145223.480031205@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: Richard Davies commit 296736076b3fd078742651c719555a488624023a upstream. Make finger2 (and also finger1) unsigned, so that if the finger index in the packet is 0 then subtracting 1 creates an array index which overflows above the existing check for FOC_MAX_FINGERS, as the existing comment says it should, instead of writing to state->fingers[-1]. Fixes: 05be1d079ec0 ("Input: psmouse - support for the FocalTech PS/2 protocol extensions") Signed-off-by: Richard Davies Link: https://patch.msgid.link/20260701190932.14960-1-richard@arachsys.com Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/mouse/focaltech.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/input/mouse/focaltech.c +++ b/drivers/input/mouse/focaltech.c @@ -197,7 +197,7 @@ static void focaltech_process_rel_packet { struct focaltech_data *priv = psmouse->private; struct focaltech_hw_state *state = &priv->state; - int finger1, finger2; + unsigned int finger1, finger2; state->pressed = packet[0] >> 7; finger1 = ((packet[0] >> 4) & 0x7) - 1;