From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 A6AC8C41514 for ; Fri, 16 Aug 2019 18:00:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7FD7320665 for ; Fri, 16 Aug 2019 18:00:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WOyQ3WS/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727585AbfHPSAm (ORCPT ); Fri, 16 Aug 2019 14:00:42 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:41303 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726900AbfHPSAm (ORCPT ); Fri, 16 Aug 2019 14:00:42 -0400 Received: by mail-pg1-f193.google.com with SMTP id x15so3300103pgg.8; Fri, 16 Aug 2019 11:00:42 -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; bh=wATUQ5AhTqVsNORBNhI3H9hrgxCh4ZvalSiVwIYDNT0=; b=WOyQ3WS/UO5ayKgN7fhfS2CGPYMqEaBxODLrYtdL5AZTCzK//pmkhLJjk22WwH2EgH gQ1lP/Gx8XdKY5FYQzXzHFU8AiQbLcIHi6gQf2p9/kaHkJCKGjuWVzhzLgt+KQLvBPOs omInQTPSACaKEaoX36Wby+FrsUAd9a3z9Ia6aRuIdNpn4/CFhV/KJvtdQURuqYlGtf1b +Jlg4iGbyePWwUg0yElh+c8T5cAI5LWhSWEiT0p1YGts5ltHEnbgEAEdvdCeSgV7MGsn ehboJZbJ7egDKE56CG8e2UZ3gYx32ye3qu0T9cu2yfKDd2Gsqp2WCrq4wNp5UYuxiRwp gJqg== 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; bh=wATUQ5AhTqVsNORBNhI3H9hrgxCh4ZvalSiVwIYDNT0=; b=ZQeU6mK6pN63NM3gmgWSrvkrb4y/PrVlLYc9fJak6DyA+FSV+/x9siB2Mytj23wJvX Dz34CVYPo8TNCvMJlgtdDTQOINl5dH9W4PUc7yToJ5QPxpskD4feybgECZRt0tdl5x9h EPEM756VDrt37Xul7+2cCzn/pyFGBekRGQ4JL0gGhexuNunJA8ekwG6e45ZpN/8WuUv4 MOxM396J8wnN/LxLmrvN5NgIa92GNFwv0xe8f0L8uZ9DcFAbYdyD9epW9qcg+tWWxPmA WxUVD9b4gLqrKIGcbv5nvfY+XfIs2hHWIQ+F7Ad7Z0b7KoFRKo/D2yW8Wh57S8muw/Wo KW0Q== X-Gm-Message-State: APjAAAVnrktObuDyVwPq92KgndhUy2obbopUaQ4mnQpbzFt8YFxzqmJq VYs3wC+8Q+m+YiL7YueOeEs= X-Google-Smtp-Source: APXvYqzg9EbcnjeIhLdeH5kFtiTthmbzOmZ7YYmw/QcVioc8vm7RaE1mqcqla5aXgXAhOFrNJ8Mu/w== X-Received: by 2002:aa7:9638:: with SMTP id r24mr11489219pfg.68.1565978441649; Fri, 16 Aug 2019 11:00:41 -0700 (PDT) Received: from bharath12345-Inspiron-5559 ([103.110.42.34]) by smtp.gmail.com with ESMTPSA id 185sm11019906pff.54.2019.08.16.11.00.40 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 16 Aug 2019 11:00:41 -0700 (PDT) From: Bharath Vedartham To: sumit.semwal@linaro.org Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, Bharath Vedartham Subject: [PATCH] dma-buf: Fix memory leak in dma_buf_set_name Date: Fri, 16 Aug 2019 23:30:22 +0530 Message-Id: <1565978422-9661-1-git-send-email-linux.bhar@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch fixes a memory leak bug reported by syzbot. Link to the bug is given at [1]. A local variable name is used to hold the copied user buffer string using strndup_user. strndup_user allocates memory using kmalloc_track_caller in memdup_user. This kmalloc allocation needs to be followed by a kfree. This patch has been tested by a compile test. [1] https://syzkaller.appspot.com/bug?id=ce692a3aa13e00e335e090be7846c6eb60ddff7a Reported-by: syzbot+b2098bc44728a4efb3e9@syzkaller.appspotmail.com Signed-off-by: Bharath Vedartham --- drivers/dma-buf/dma-buf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index f45bfb2..9798f6d 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -342,6 +342,7 @@ static long dma_buf_set_name(struct dma_buf *dmabuf, const char __user *buf) } kfree(dmabuf->name); dmabuf->name = name; + kfree(name); out_unlock: mutex_unlock(&dmabuf->lock); -- 2.7.4