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 1C4BC347FCD; Thu, 28 May 2026 20:48:55 +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=1780001336; cv=none; b=KN6K933v3qy+d5ZKzqons2vy2PhcWRkXGUN5IwXgx1R7O+WuUqmK07Kk2mA+DLUFDcJ4Iahmb331pBHDiN5p2UVhhhFysNn+7tHkz/cdkUQChUVQi+7EaF7hJGTV+nJCyiRWrfFMBj5MakM5D8hnNOCqaM4pwL6q+m7NuRRug7I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780001336; c=relaxed/simple; bh=CCvWq3dMecmDRBjsp4nixDWPuZx9xSFxw4Ca4brjKCI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gDqTwoP3U6CTSbYC/+58J8tZwbaiUw1qNtcrntJSExVZfpPoWtbDrb6NbL+9EJ6J8HsR6kYW4ZSngEsk/1N96oUCnIZs2n5ngFt2jAvBEYoYob0VOZbY0lNXrIRfk4h3j9iN3zisrRNfjzxgat8PHifTx7p+SizNOaho9yq/0Bs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Z5GmlEA2; 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="Z5GmlEA2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79D441F000E9; Thu, 28 May 2026 20:48:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780001335; bh=DNADbt9Ak2rjgrddodRIi+E1ywsNnUcCPx5DTTT+Nro=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Z5GmlEA2Qfru+6BbE9ItFkS0o/tv94VdYTYRoY8iStmGCs/N6+YDwP++SlFwWxcMA uxsBUgxqCKsk3Tzw9nRqRA5cQudYlPXC9P5Jj5FeOD1E6Gw/cDkHXQu/k8svg1IhMH I4snrmT1Xr8p/04kRN+JwLZVzSU3dKwXg7bePr6E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Abdurrahman Hussain , Guenter Roeck Subject: [PATCH 6.6 091/186] hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer Date: Thu, 28 May 2026 21:49:31 +0200 Message-ID: <20260528194931.393346774@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260528194928.941004471@linuxfoundation.org> References: <20260528194928.941004471@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Abdurrahman Hussain commit 43cae21424ff8e33894a0f86c6b80b840c049fd7 upstream. adm1266_pmbus_block_xfer() copies the device-supplied block payload into the caller-provided buffer using the device-supplied length: memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]); The helper does not know how large data_r is and trusts the device to return at most one record's worth of bytes. adm1266_nvmem_read_blackbox() violates that contract: it advances read_buff inside data->dev_mem in ADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to write up to ADM1266_PMBUS_BLOCK_MAX (255) bytes. A device that returns more than 64 bytes on the trailing record (read_buff offset 1984 in the 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes before the post-call if (ret != ADM1266_BLACKBOX_SIZE) return -EIO; can reject the response. Contain the fix in the caller without changing the helper signature: read each record into a 255-byte local bounce buffer that matches the helper's maximum output, validate the returned length, and only then copy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot. Fixes: 407dc802a9c0 ("hwmon: (pmbus/adm1266) Add Block process call") Cc: stable@vger.kernel.org Signed-off-by: Abdurrahman Hussain Link: https://lore.kernel.org/r/20260515-adm1266-fixes-v1-5-1c1ea1349cfe@nexthop.ai Signed-off-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/hwmon/pmbus/adm1266.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/hwmon/pmbus/adm1266.c +++ b/drivers/hwmon/pmbus/adm1266.c @@ -348,6 +348,7 @@ static void adm1266_init_debugfs(struct static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff) { + u8 record[ADM1266_PMBUS_BLOCK_MAX]; int record_count; char index; u8 buf[I2C_SMBUS_BLOCK_MAX]; @@ -365,13 +366,14 @@ static int adm1266_nvmem_read_blackbox(s return -EIO; for (index = 0; index < record_count; index++) { - ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff); + ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, record); if (ret < 0) return ret; if (ret != ADM1266_BLACKBOX_SIZE) return -EIO; + memcpy(read_buff, record, ADM1266_BLACKBOX_SIZE); read_buff += ADM1266_BLACKBOX_SIZE; }