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 4238A33F59A; Sat, 12 Sep 2026 12:13:37 +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=1789215218; cv=none; b=uZ0I8fi0XI/yJOiAb31Nh1hgr8ahW1QwRm3ThTuzv7LsZJGOy2It2SUR0vn4N8ieZ1zbmP3DAA6rAqe456PpCX7bPFUry/eE7uOEc+sWBX8f+bugPnnEIsKs0WbdFWnJerPzISxVL/eD5hO8aO4wl6rQCNNcIyLxA7Mv/dd7lus= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789215218; c=relaxed/simple; bh=1sF3D4f1nba+V76fOgvsJHcODRFDbYdw3aAK1DG1iKk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qYRHivd9pbD92E7SA30RU0gROBrzq+0NY9sw0Dp2FMr62nvJairZ36hpmbA3+O3EwrqrOwIBM7L5YDJdxrwJbvneByzOjbOyimcSTydg5AS5KNNwK+xBuY4XuI0iKDzmdTsW2GZOGkUk4zuv3J/FTOvRhHGSVuMpnp4e/imwJ4g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Iy7BcH3h; 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="Iy7BcH3h" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2A76D1F000FF; Sat, 12 Sep 2026 12:13:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789215216; bh=xly/8K+JXee5hocIZthOR2swurhRgeRHcciuAlOoNbs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Iy7BcH3hduR5JSvXHIBnRWr9vRCtt7L82TLEfdLLsiSlrkBneEOdvCVJUL+bkInTF 5aAG5eYfNLnyvboUUjYlfLMmwsLZwjQpacZsPzEqd++2wKAXz8VALMJfta1VloIMpt CnbENbKKgVaAnz9yhVQUxCcQatZ2SiEnAn4IuMY4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Maoyi Xie , Sakari Ailus , Sasha Levin Subject: [PATCH 6.12 0486/1376] usb: ljca: bound bank_num in ljca_enumerate_gpio() Date: Sat, 12 Sep 2026 08:48:32 +0200 Message-ID: <20260912065618.369268731@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.535295758@linuxfoundation.org> References: <20260912065607.535295758@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: Maoyi Xie [ Upstream commit dd9483726d0f16c1a56879c3edb65128259a4e2b ] ljca_enumerate_gpio() reads desc->bank_num from the device and loops valid_pin[i] = get_unaligned_le32(...) for i < bank_num. valid_pin[] holds only LJCA_MAX_GPIO_NUM / 32 = 2 entries. Two checks run before the loop. The reply length must match struct_size(desc, bank_desc, bank_num). The product pins_per_bank * bank_num must not exceed LJCA_MAX_GPIO_NUM. Neither one bounds bank_num against the size of valid_pin[]. The reply is capped at LJCA_MAX_PAYLOAD_SIZE (60) bytes, so the struct_size check limits bank_num to 9. A device that reports bank_num 9 with pins_per_bank 7 still passes both checks. gpio_num is 63 and the reply is 56 bytes. The loop then writes nine u32 into the two entry array and overruns valid_pin[] on the stack. A broken or malicious LJCA device can therefore overflow the stack. Reject a bank_num that does not fit valid_pin[]. Fixes: acd6199f195d ("usb: Add support for Intel LJCA device") Signed-off-by: Maoyi Xie Acked-by: Sakari Ailus Link: https://patch.msgid.link/178176358875.3352358.6059116660356914900@maoyixie.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/misc/usb-ljca.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/misc/usb-ljca.c b/drivers/usb/misc/usb-ljca.c index d9c21f7830557..e6e3888451fa2 100644 --- a/drivers/usb/misc/usb-ljca.c +++ b/drivers/usb/misc/usb-ljca.c @@ -585,6 +585,9 @@ static int ljca_enumerate_gpio(struct ljca_adapter *adap) if (gpio_num > LJCA_MAX_GPIO_NUM) return -EINVAL; + if (desc->bank_num > ARRAY_SIZE(valid_pin)) + return -EINVAL; + /* construct platform data */ gpio_info = kzalloc(sizeof *gpio_info, GFP_KERNEL); if (!gpio_info) -- 2.53.0