From patchwork Mon Jul 12 06:11:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 473820 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 9F9D7C11F72 for ; Mon, 12 Jul 2021 07:29:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9821E6108B for ; Mon, 12 Jul 2021 07:29:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241864AbhGLHbn (ORCPT ); Mon, 12 Jul 2021 03:31:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:43946 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344473AbhGLH3e (ORCPT ); Mon, 12 Jul 2021 03:29:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 499B561493; Mon, 12 Jul 2021 07:25:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626074725; bh=QIcrSoPAStZLEydIq7pJN/J5TiFrrMuUZPmEuxKOUuQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O6qoVCudH1wKPp9a4Ds28AduOE3pMmOFrR04DbjtW2xMLYwH2myfYY5FfFK3zkNyG LHufqPDyd+bXi2SyALyPBT57VoIa40on8wBBIUirAipOfnyXK9g9GzD8qZLXc8c8q5 VTgGRHQnj6qzIrVkqzXyHv6eh1eMOGuvOHAJREIw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Skripkin , Sasha Levin Subject: [PATCH 5.12 623/700] staging: rtl8712: fix memory leak in rtl871x_load_fw_cb Date: Mon, 12 Jul 2021 08:11:46 +0200 Message-Id: <20210712061042.108150835@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060924.797321836@linuxfoundation.org> References: <20210712060924.797321836@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pavel Skripkin [ Upstream commit e02a3b945816a77702a2769a70ef5f9b06e49d54 ] There is a leak in rtl8712 driver. The problem was in non-freed adapter data if firmware load failed. This leak can be reproduced with this code: https://syzkaller.appspot.com/text?tag=ReproC&x=16612f02d00000, Autoload must fail (to not hit memory leak reported by syzkaller) There are 2 possible ways how rtl871x_load_fw_cb() and r871xu_dev_remove() can be called (in case of fw load error). 1st case: r871xu_dev_remove() then rtl871x_load_fw_cb() In this case r871xu_dev_remove() will wait for completion and then will jump to the end, because rtl871x_load_fw_cb() set intfdata to NULL: if (pnetdev) { struct _adapter *padapter = netdev_priv(pnetdev); /* never exit with a firmware callback pending */ wait_for_completion(&padapter->rtl8712_fw_ready); pnetdev = usb_get_intfdata(pusb_intf); usb_set_intfdata(pusb_intf, NULL); if (!pnetdev) goto firmware_load_fail; ... clean up code here ... } 2nd case: rtl871x_load_fw_cb() then r871xu_dev_remove() In this case pnetdev (from code snippet above) will be zero (because rtl871x_load_fw_cb() set it to NULL) And clean up code won't be executed again. So, in all cases we need to free adapted data in rtl871x_load_fw_cb(), because disconnect function cannot take care of it. And there won't be any race conditions, because complete() call happens after setting intfdata to NULL. In previous patch I moved out free_netdev() from r8712_free_drv_sw() and that's why now it's possible to free adapter data and then call complete. Fixes: 8c213fa59199 ("staging: r8712u: Use asynchronous firmware loading") Signed-off-by: Pavel Skripkin Link: https://lore.kernel.org/r/81e68fe0194499cc2e7692d35bc4dcf167827d8f.1623620630.git.paskripkin@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/rtl8712/hal_init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/staging/rtl8712/hal_init.c b/drivers/staging/rtl8712/hal_init.c index 715f1fe8b472..22974277afa0 100644 --- a/drivers/staging/rtl8712/hal_init.c +++ b/drivers/staging/rtl8712/hal_init.c @@ -40,7 +40,10 @@ static void rtl871x_load_fw_cb(const struct firmware *firmware, void *context) dev_err(&udev->dev, "r8712u: Firmware request failed\n"); usb_put_dev(udev); usb_set_intfdata(usb_intf, NULL); + r8712_free_drv_sw(adapter); + adapter->dvobj_deinit(adapter); complete(&adapter->rtl8712_fw_ready); + free_netdev(adapter->pnetdev); return; } adapter->fw = firmware;