From patchwork Thu May 20 09:17:57 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: 445766 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=-19.1 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, 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 55ACBC433ED for ; Thu, 20 May 2021 09:47:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C1296145E for ; Thu, 20 May 2021 09:47:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233811AbhETJso (ORCPT ); Thu, 20 May 2021 05:48:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:47818 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233889AbhETJqk (ORCPT ); Thu, 20 May 2021 05:46:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8881D613EB; Thu, 20 May 2021 09:34:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621503248; bh=xYtFkeN39Orcq0WeEDTUJpCePQ2GI+uIcpy5yH+7+II=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LIraYpjH6eGqblhgBKHH5csqq3puXB9pGgEqAs3IR//KgJ8Om8m4EgxWKCKibyk68 r/2VjLYEY/EDNGq2dOf24huCuplyPdUgNl8xTIoN8zflYEMP/vDsvHItWqO8eR9bXs 0HSwIM4NbLJiIZSG+oqQ6Zr2CCpUHuGYIld41PIM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peter Chen , Hemant Kumar , Wesley Cheng Subject: [PATCH 4.19 108/425] usb: gadget: Fix double free of device descriptor pointers Date: Thu, 20 May 2021 11:17:57 +0200 Message-Id: <20210520092135.002557667@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092131.308959589@linuxfoundation.org> References: <20210520092131.308959589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hemant Kumar commit 43c4cab006f55b6ca549dd1214e22f5965a8675f upstream. Upon driver unbind usb_free_all_descriptors() function frees all speed descriptor pointers without setting them to NULL. In case gadget speed changes (i.e from super speed plus to super speed) after driver unbind only upto super speed descriptor pointers get populated. Super speed plus desc still holds the stale (already freed) pointer. Fix this issue by setting all descriptor pointers to NULL after freeing them in usb_free_all_descriptors(). Fixes: f5c61225cf29 ("usb: gadget: Update function for SuperSpeedPlus") cc: stable@vger.kernel.org Reviewed-by: Peter Chen Signed-off-by: Hemant Kumar Signed-off-by: Wesley Cheng Link: https://lore.kernel.org/r/1619034452-17334-1-git-send-email-wcheng@codeaurora.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/config.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/usb/gadget/config.c +++ b/drivers/usb/gadget/config.c @@ -194,9 +194,13 @@ EXPORT_SYMBOL_GPL(usb_assign_descriptors void usb_free_all_descriptors(struct usb_function *f) { usb_free_descriptors(f->fs_descriptors); + f->fs_descriptors = NULL; usb_free_descriptors(f->hs_descriptors); + f->hs_descriptors = NULL; usb_free_descriptors(f->ss_descriptors); + f->ss_descriptors = NULL; usb_free_descriptors(f->ssp_descriptors); + f->ssp_descriptors = NULL; } EXPORT_SYMBOL_GPL(usb_free_all_descriptors);