From patchwork Mon Jul 26 15:31:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 486197 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F36DC432BE for ; Mon, 26 Jul 2021 15:31:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC2AC6023B for ; Mon, 26 Jul 2021 15:31:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234851AbhGZOui (ORCPT ); Mon, 26 Jul 2021 10:50:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43586 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234766AbhGZOuh (ORCPT ); Mon, 26 Jul 2021 10:50:37 -0400 Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com [IPv6:2a00:1450:4864:20::234]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF15BC061764; Mon, 26 Jul 2021 08:31:05 -0700 (PDT) Received: by mail-lj1-x234.google.com with SMTP id l4so11769082ljq.4; Mon, 26 Jul 2021 08:31:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=O/A0BOjIm3z4R6uvHm/L/KPzVr+aE6zy1njqB67lKvI=; b=matyVmWB9x6rQG2ibSGAIqTE9ZYLQxC9cofwJ/WSe5eMlOYJwApNSHUmN7ob/QmYzZ Zf4L+DLxYLSi9IP1/fTFN4Fvq9Dj3oA+q0TtLk/nLV0AvbVnB+mAGIy+OHxU54Slrx+5 4ZYOazlPl8hjBfZssrtpKqBcCapV1xll7BQc1wop35z2WespNpYdz9TluRWJJjWzotWa NGIj6PaQmywdRyZjC+FlH/VG49fqnXPxXBbRCqH01kHT06NBAA/wjodIybcv8agXZ1ZM O0y9Nk6YQFO7ZlALrVxDcq5jw/mpNKc0h+VJCrVEMf6uPp4Piex61RFZDLuNp9x/EZGI 6T7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=O/A0BOjIm3z4R6uvHm/L/KPzVr+aE6zy1njqB67lKvI=; b=RzY4rOqShocaHMvYtEVKBgL7k+B6EgODFGYHQetzfBnT3FxXXn6fNNDCSl3cP1TCGn S+n6ygPrt9LP2myW6ehVBFlmiWVWdCMBgsBPQ4yLscuC4KPfYDrQsw4lgSYlS69xohRP 8i9tJbZpIOdmgaNi+Vii4AhLx98MqS0KAc4o3jKGPm3kxCPwkVKHjS5/joJd9iDc6Zcd mv/EaIzta3AHXuGOxhRCyI8Bvc0jFfqdM4MbOIUFliAYAMwt/GTkBpgWf51hhZeIiL9R GrdeD8S3Ew0oO3o2FAbMOH+gK+67KXTdYupLjzGvl454DYxkytfG7JIoXHwQZ1ngYKhC PXHg== X-Gm-Message-State: AOAM5326vR7PTbyHVnbswpTvF7I65qJEbICIcZCm80pqsRB6WMqlmBf6 Orn5ZizhakEoNhtcGYBY93c= X-Google-Smtp-Source: ABdhPJwda2EQ55vKJ2lD86vBnBC1lEUgq1+UiH+MLlPORmQWoyKNNldrmwI2osCgdCO8uvMd8rCIGQ== X-Received: by 2002:a2e:a90b:: with SMTP id j11mr12663613ljq.338.1627313464111; Mon, 26 Jul 2021 08:31:04 -0700 (PDT) Received: from localhost.localdomain ([46.61.204.59]) by smtp.gmail.com with ESMTPSA id m11sm2623lji.8.2021.07.26.08.31.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jul 2021 08:31:03 -0700 (PDT) From: Pavel Skripkin To: wg@grandegger.com, mkl@pengutronix.de, davem@davemloft.net, socketcan@hartkopp.net, mailhol.vincent@wanadoo.fr, Stefan.Maetje@esd.eu, matthias.fuchs@esd.eu Cc: linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin Subject: [PATCH 3/3] can: esd_usb2: fix memory leak Date: Mon, 26 Jul 2021 18:31:01 +0300 Message-Id: X-Mailer: git-send-email 2.32.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In esd_usb2_setup_rx_urbs() MAX_RX_URBS coherent buffers are allocated and there is nothing, that frees them: 1) In callback function the urb is resubmitted and that's all 2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER is not set (see esd_usb2_setup_rx_urbs) and this flag cannot be used with coherent buffers. So, all allocated buffers should be freed with usb_free_coherent() explicitly. Side note: This code looks like a copy-paste of other can drivers. The same patch was applied to mcba_usb driver and it works nice with real hardware. There is no change in functionality, only clean-up code for coherent buffers Fixes: 96d8e90382dc ("can: Add driver for esd CAN-USB/2 device") Signed-off-by: Pavel Skripkin Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/net/can/usb/esd_usb2.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c index 65b58f8fc328..303560abe2b0 100644 --- a/drivers/net/can/usb/esd_usb2.c +++ b/drivers/net/can/usb/esd_usb2.c @@ -195,6 +195,8 @@ struct esd_usb2 { int net_count; u32 version; int rxinitdone; + void *rxbuf[MAX_RX_URBS]; + dma_addr_t rxbuf_dma[MAX_RX_URBS]; }; struct esd_usb2_net_priv { @@ -545,6 +547,7 @@ static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) for (i = 0; i < MAX_RX_URBS; i++) { struct urb *urb = NULL; u8 *buf = NULL; + dma_addr_t buf_dma; /* create a URB, and a buffer for it */ urb = usb_alloc_urb(0, GFP_KERNEL); @@ -554,7 +557,7 @@ static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) } buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, - &urb->transfer_dma); + &buf_dma); if (!buf) { dev_warn(dev->udev->dev.parent, "No memory left for USB buffer\n"); @@ -562,6 +565,8 @@ static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) goto freeurb; } + urb->transfer_dma = buf_dma; + usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), buf, RX_BUFFER_SIZE, @@ -574,8 +579,12 @@ static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) usb_unanchor_urb(urb); usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, urb->transfer_dma); + goto freeusrb; } + dev->rxbuf[i] = buf; + dev->rxbuf_dma[i] = buf_dma; + freeurb: /* Drop reference, USB core will take care of freeing it */ usb_free_urb(urb); @@ -663,6 +672,11 @@ static void unlink_all_urbs(struct esd_usb2 *dev) int i, j; usb_kill_anchored_urbs(&dev->rx_submitted); + + for (i = 0; i < MAX_RX_URBS; ++i) + usb_free_coherent(dev->udev, RX_BUFFER_SIZE, + dev->rxbuf[i], dev->rxbuf_dma[i]); + for (i = 0; i < dev->net_count; i++) { priv = dev->nets[i]; if (priv) {