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 B684C233D9E; Sat, 30 May 2026 18:17:25 +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=1780165046; cv=none; b=DoPipez74LxhGtrjWa4Vom63HOL493rLfwi26zD0t6zNRqs/XfQEZmjJM0annr1/xfAN/7qyRozigXgj9b0UjBr3gyNFDXl3WoEWYXCj1tq9oS/AbZgYqKkKFYuariBAkIgoK4lAQxXNsvS0fszVWvBIDCa7WLcKnM+jyfDqDDM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780165046; c=relaxed/simple; bh=yY9ZO0V1k892pR8/kRNUhPkaF/XKhg/d5Ec5dSQJpco=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bPTfISvpVnQn0EEkSSVay4v9ISriUt+G0dKu+wSmAYa2G78OxYq9pjj5k2/NFR6Npp4q+sl0USDj+0JoXn0mly/493R4UGCPL8yNUQWcAxYYfXndIHNuYMCGSN+PXYAXrRuCRD5tpLM2QI66j7Ro8er9cZLe+eXy5dpzPTGOpxc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VAE/PfRF; 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="VAE/PfRF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8CD61F00893; Sat, 30 May 2026 18:17:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780165045; bh=4OeTYEJwpYbBzz8bmOe4U0s/qa4URnWZIjXRONxj6Ro=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VAE/PfRFdYJioPaVqgiR7HEs3qxwJ8Qcr8LAfJ1F66p9F5DFsY2ZXsUI5jsXNwIVQ xF81EBxBvSiQvx0UTZBtf5ovy9EYim1hf0vuFKjwq3bKgFJ+OYLMMghp+qpgryD4aP KxtE78oKo9a4WyGsMIxrHXoxoioTqSTy7iGbB72o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Abdurrahman Hussain , Guenter Roeck Subject: [PATCH 5.15 717/776] hwmon: (pmbus/adm1266) reject implausible blackbox record_count Date: Sat, 30 May 2026 18:07:11 +0200 Message-ID: <20260530160258.349492360@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Abdurrahman Hussain commit 4afca954622d672ea65ed961bed01cf91caa034e upstream. adm1266_nvmem_read_blackbox() loops over a record_count that comes straight from byte 3 of the BLACKBOX_INFO response. The destination buffer is data->dev_mem, sized for the nvmem cell's declared 2048 bytes (ADM1266_BLACKBOX_MAX_RECORDS * ADM1266_BLACKBOX_SIZE = 32 * 64). A device that reports a record_count greater than 32 -- whether due to firmware bugs, bus corruption, or a non-responsive slave returning 0xff -- would walk read_buff past the end of the dev_mem allocation on the trailing iterations. Cap record_count at ADM1266_BLACKBOX_MAX_RECORDS (introduced here) before entering the loop and return -EIO on any larger value, so a malformed BLACKBOX_INFO response cannot drive the loop out of bounds. Fixes: 15609d189302 ("hwmon: (pmbus/adm1266) read blackbox") Cc: stable@vger.kernel.org Signed-off-by: Abdurrahman Hussain Link: https://lore.kernel.org/r/20260515-adm1266-fixes-v1-3-1c1ea1349cfe@nexthop.ai Signed-off-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/hwmon/pmbus/adm1266.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/hwmon/pmbus/adm1266.c +++ b/drivers/hwmon/pmbus/adm1266.c @@ -46,6 +46,7 @@ #define ADM1266_BLACKBOX_OFFSET 0 #define ADM1266_BLACKBOX_SIZE 64 +#define ADM1266_BLACKBOX_MAX_RECORDS 32 #define ADM1266_PMBUS_BLOCK_MAX 255 @@ -362,6 +363,8 @@ static int adm1266_nvmem_read_blackbox(s return -EIO; record_count = buf[3]; + if (record_count > ADM1266_BLACKBOX_MAX_RECORDS) + return -EIO; for (index = 0; index < record_count; index++) { ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff);