From patchwork Tue Mar 23 07:33:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lv Yunlong X-Patchwork-Id: 407156 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, 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 DBEEFC433E0 for ; Tue, 23 Mar 2021 07:34:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AA150619BF for ; Tue, 23 Mar 2021 07:34:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229493AbhCWHe0 (ORCPT ); Tue, 23 Mar 2021 03:34:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229670AbhCWHeV (ORCPT ); Tue, 23 Mar 2021 03:34:21 -0400 Received: from ustc.edu.cn (email6.ustc.edu.cn [IPv6:2001:da8:d800::8]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BD46BC061574; Tue, 23 Mar 2021 00:34:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mail.ustc.edu.cn; s=dkim; h=Received:From:To:Cc:Subject:Date: Message-Id:MIME-Version:Content-Transfer-Encoding; bh=bhswRq59Lz Qz4IxCsSIGEpezgpMNfSZEGd8ZjnkD4Ks=; b=vn2fP1t8k7f5tsYZTq/9CGjnha H7GDHwYOenEl1ReUy1MUsIZccTcGlESML7iAAygUivjRz7acdXlmtqtxOVCcIu0U OMZ6GKwYMIvgbEVM/pbNaBVG4fAZ9DjPgrMfxAylJQdFLWeCfWXqRhJyK3lq3toF /UYd/ikvHwcLmmdVk= Received: from ubuntu.localdomain (unknown [202.38.69.14]) by newmailweb.ustc.edu.cn (Coremail) with SMTP id LkAmygC3v0vhmVlgw3seAA--.4S4; Tue, 23 Mar 2021 15:33:53 +0800 (CST) From: Lv Yunlong To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org Cc: linux-hyperv@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, Lv Yunlong Subject: [PATCH] video/fbdev: Fix a double free in hvfb_probe Date: Tue, 23 Mar 2021 00:33:50 -0700 Message-Id: <20210323073350.17697-1-lyl2019@mail.ustc.edu.cn> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: LkAmygC3v0vhmVlgw3seAA--.4S4 X-Coremail-Antispam: 1UD129KBjvJXoW7ArW5WFWfJryrAw17WF47CFg_yoW8JFWUpF 4kJFyqyrWrtr1j93ykAr4vyFyF9F4fKr9xWr12ya4Fka43J3y8Wr13AFW2krZ5ArW5Gw13 ZF1Yy345Ga45CaUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvG14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U JVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1lnxkEFVAIw20F6cxK64vIFxWle2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xv F2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r 4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I 648v4I1lc2xSY4AK67AK6r4xMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r 4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF 67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2I x0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAIw20EY4v20xvaj40_WFyUJVCq3wCI42IY 6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa 73UjIFyTuYvjfUYhL8DUUUU X-CM-SenderInfo: ho1ojiyrz6zt1loo32lwfovvfxof0/ Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org In function hvfb_probe in hyperv_fb.c, it calls hvfb_getmem(hdev, info) and return err when info->apertures is freed. In the error1 label of hvfb_probe, info->apertures will be freed twice by framebuffer_release(info). My patch sets info->apertures to NULL after it was freed to avoid double free. Signed-off-by: Lv Yunlong --- drivers/video/fbdev/hyperv_fb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c index c8b0ae676809..2fc9b507e73a 100644 --- a/drivers/video/fbdev/hyperv_fb.c +++ b/drivers/video/fbdev/hyperv_fb.c @@ -1032,6 +1032,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) if (!pdev) { pr_err("Unable to find PCI Hyper-V video\n"); kfree(info->apertures); + info->apertures = NULL; return -ENODEV; } @@ -1130,6 +1131,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) pci_dev_put(pdev); } kfree(info->apertures); + info->apertures = NULL; return 0; @@ -1142,6 +1144,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) if (!gen2vm) pci_dev_put(pdev); kfree(info->apertures); + info->apertures = NULL; return -ENOMEM; }