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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2DCF7C00A8F for ; Mon, 23 Oct 2023 11:15:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233707AbjJWLPI (ORCPT ); Mon, 23 Oct 2023 07:15:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59504 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233702AbjJWLPH (ORCPT ); Mon, 23 Oct 2023 07:15:07 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C4A3BFD for ; Mon, 23 Oct 2023 04:15:04 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 134C6C433CA; Mon, 23 Oct 2023 11:15:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1698059704; bh=jNywYjHlfngqQTn+zspJdUcjVLztNNTj8cGatBiKZqI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FMYSgDjVTy1C4qYri6hbKdFZn64UcLbdWMcA1GsZquKQoHOixbEs2JqJd48OURiGf w6tr4KykVQkumK3Ba3XjiE4sKuHj0pwnQTQtZRo11vpth6fa893s2+WOQRZPHUh3N/ GABTC7jB4Cy57YwKu29xm0KXbtB7FATjLJuFCluo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xingxing Luo Subject: [PATCH 4.19 24/98] usb: musb: Get the musb_qh poniter after musb_giveback Date: Mon, 23 Oct 2023 12:56:13 +0200 Message-ID: <20231023104814.441401415@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231023104813.580375891@linuxfoundation.org> References: <20231023104813.580375891@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xingxing Luo commit 33d7e37232155aadebe4145dcc592f00dabd7a2b upstream. When multiple threads are performing USB transmission, musb->lock will be unlocked when musb_giveback is executed. At this time, qh may be released in the dequeue process in other threads, resulting in a wild pointer, so it needs to be here get qh again, and judge whether qh is NULL, and when dequeue, you need to set qh to NULL. Fixes: dbac5d07d13e ("usb: musb: host: don't start next rx urb if current one failed") Cc: stable@vger.kernel.org Signed-off-by: Xingxing Luo Link: https://lore.kernel.org/r/20230919033055.14085-1-xingxing.luo@unisoc.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/musb_host.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -339,10 +339,16 @@ static void musb_advance_schedule(struct musb_giveback(musb, urb, status); qh->is_ready = ready; + /* + * musb->lock had been unlocked in musb_giveback, so qh may + * be freed, need to get it again + */ + qh = musb_ep_get_qh(hw_ep, is_in); + /* reclaim resources (and bandwidth) ASAP; deschedule it, and * invalidate qh as soon as list_empty(&hep->urb_list) */ - if (list_empty(&qh->hep->urb_list)) { + if (qh && list_empty(&qh->hep->urb_list)) { struct list_head *head; struct dma_controller *dma = musb->dma_controller; @@ -2424,6 +2430,7 @@ static int musb_urb_dequeue(struct usb_h * and its URB list has emptied, recycle this qh. */ if (ready && list_empty(&qh->hep->urb_list)) { + musb_ep_set_qh(qh->hw_ep, is_in, NULL); qh->hep->hcpriv = NULL; list_del(&qh->ring); kfree(qh);