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 92B933644C1; Thu, 20 Aug 2026 15:02:16 +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=1787238137; cv=none; b=O8CH05jjzyUa1qFrZeQlTEMPwpi1cxAXa37/ZobLGthByUFYsERK77Xkm9X5GOLOAtQ6eCpJXAdoCurIGd5rZwfeoefaI501YMrkrabdMmiN0JrN3Bh0JX/jM1l01sN0rCNJolXQSKjofPhLWN1B6r2lquOZHbfKaLDQ7Sch7hs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787238137; c=relaxed/simple; bh=/IZtdeCUoCcMHzuHfDGrK/DPgKaA8ZU4FO+UvLKtt5E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aGRVsJ2ihPrBu7x/OTW+nvljS+hdT7h2MPp6VRtErbHWfB/tONI7O/rIkSmp8mXP7F2V/C5+pCvSDHbL5d7JG0Pvhc/oUN5hDHTxyAeJ4ptTEdx1imMzrE6mQiBwhjmKiScUZx+Z0g5MkLVZbyNfegvInngPiM2sf+w5LQlwO5k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Nzwnfhtd; 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="Nzwnfhtd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4F6E1F000E9; Thu, 20 Aug 2026 15:02:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787238136; bh=4bokesH9KyuXL8b/fDXas3EHFia0/hpSilglb7pFflg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Nzwnfhtdk+7UgThd77hW2QQujk9bbFe1BT8CJKpOpnElADk+Ynhw93jLLufQoZlCN PtbkSkQxoN8y0ulyjdWcgZTenCaH5msnP+rGhb/XpvZ2mOgLC96s0Uao2lY5VF/5+c Ik0EBykom8FE14VeNpZlb7GLUDUYcubyIipCNjW8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Richard Davies , Dmitry Torokhov Subject: [PATCH 7.1 044/228] Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet Date: Thu, 20 Aug 2026 16:53:06 +0200 Message-ID: <20260820145245.810625924@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820145244.450574346@linuxfoundation.org> References: <20260820145244.450574346@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 7.1-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;