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 51E8E47DD42; Thu, 20 Aug 2026 17:45:49 +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=1787247950; cv=none; b=SJP6hel0eqlEVBVIortB8khlWyosXA2d41aArpmmwmrzFHWX3JPlrd7bp1VRJ/kSEobmqyyqoL4f/44WKzE5UNGt2dRh232ZB25MFLuFy3CD5MnP5lJyrlqerRNmsQVGSG8DBcVVBHqQPkiBQmQeeVTaX/yK2LtVAOnl7tEsNM0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787247950; c=relaxed/simple; bh=Ij6GGijthNCh7AdHrhCgmPT6ROZmpEIA/+WJ3L15rm4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cASlSDGzbYLuh7wjIgj2cD0dZn4DkTMKpTjGxb6/Y5knAnbyxXyYor4T9z/fCZdrv9683ZQsSWa9XgFY75zUYNZb74em0+1+oelup0h9sQQ7fK1TxzolVk5fn5rvXs+e2ZMGKBTftsuoeqB0VCCWLspI3L6ly2THyEi+pczZCS0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=u4M6PB06; 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="u4M6PB06" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 683161F000E9; Thu, 20 Aug 2026 17:45:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787247949; bh=E1JAjh3OIOHUth7P6/ntOEUJkzoiDOq6kVyGaCvCx1o=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=u4M6PB06VDw+pj01CVhoIQ8G+YMeLEGtTFtMZj4VSmjqF7yIWCwk/nXB9mXuL96IA fICDzRMvdUhhsSq0F1Xbd20z7bTKF5xe3HGYpWqhULVtf0cXDXY+Tr/drXoH2OaHfs fdA2EOtFy6ABcAoJIEFEM/FoNPoSnnAOdSDrQyh0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Richard Davies , Dmitry Torokhov Subject: [PATCH 6.1 021/303] Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet Date: Thu, 20 Aug 2026 16:52:37 +0200 Message-ID: <20260820145253.817989361@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820145253.200766705@linuxfoundation.org> References: <20260820145253.200766705@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 6.1-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;