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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A19D4C433FE for ; Wed, 13 Oct 2021 14:15:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89FA3610EA for ; Wed, 13 Oct 2021 14:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236540AbhJMORY (ORCPT ); Wed, 13 Oct 2021 10:17:24 -0400 Received: from informare.org ([217.11.52.70]:46786 "EHLO informare.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236515AbhJMORV (ORCPT ); Wed, 13 Oct 2021 10:17:21 -0400 Received: (qmail 9981 invoked from network); 13 Oct 2021 14:15:17 -0000 Received: from unknown (HELO ?192.168.2.105?) (faber@faberman.de@87.132.159.142) by 0 with ESMTPA; 13 Oct 2021 14:15:17 -0000 From: Florian Faber Subject: [PATCH v4] usb: gadget: composite: req->complete not set, using wrong callback for complete To: linux-usb@vger.kernel.org Cc: gregkh@linuxfoundation.org References: Message-ID: Date: Wed, 13 Oct 2021 16:15:13 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org In usb_composite_setup_continue, req->complete is not set, leaving the previous value untouched. After completion of the ep0 transaction, the UDC would then call whatever complete callback was set previously with the composite cdev as context, leading to all sorts of havoc. A typical call trace looks like this: A setup packet for mass storage, ending up in RNDIS's complete function: ---------------------------snip--------------------------------- [ 183.795661] [] (rndis_response_complete [usb_f_rndis]) from [] (xgs_iproc_ep_enable+0x92c/0xd2c [xgs_iproc_udc]) [ 183.795666] r5:df5d73ac r4:df767c80 [ 183.795682] [] (xgs_iproc_ep_enable [xgs_iproc_udc]) from [] (xgs_iproc_ep_queue+0x384/0x5bc [xgs_iproc_udc]) [ 183.795687] r7:df767cb8 r6:df5d7380 r5:df767c80 r4:df5d73ac [ 183.795706] [] (xgs_iproc_ep_queue [xgs_iproc_udc]) from [] (usb_ep_queue+0x1f0/0x238) [ 183.795713] r10:43425355 r9:df767c80 r8:df767c80 r7:a00f0013 r6:df5d73ac r5:df767c80 [ 183.795716] r4:df65dea8 [ 183.795743] [] (usb_ep_queue) from [] (usb_composite_overwrite_options+0x128/0x184 [libcomposite]) [ 183.795750] r9:00055302 r8:df767c80 r7:a00f0013 r6:df65df04 r5:df767c80 r4:df65dea8 [ 183.795777] [] (usb_composite_overwrite_options [libcomposite]) from [] (usb_composite_setup_continue+0x88/0x138 [libcomposite]) [ 183.795782] r7:a00f0013 r6:df65df04 r5:00000000 r4:df65dea8 [ 183.795812] [] (usb_composite_setup_continue [libcomposite]) from [] (fsg_alloc_inst+0xa5c/0xac8 [usb_f_mass_storage]) [ 183.795819] r9:00055302 r8:00000003 r7:deca5800 r6:00000001 r5:df595a80 r4:deca5948 [ 183.795840] [] (fsg_alloc_inst [usb_f_mass_storage]) from [] (fsg_main_thread+0x9c/0x15dc [usb_f_mass_storage]) [ 183.795846] r8:df770000 r7:df595a80 r6:deca1cc0 r5:df724000 r4:deca5800 [ 183.795864] [] (fsg_main_thread [usb_f_mass_storage]) from [] (kthread+0x14c/0x154) [ 183.795870] r10:df785d14 r9:00000000 r8:deca5800 r7:df6c31b8 r6:df70f580 r5:df724000 [ 183.795873] r4:df6c3180 [ 183.795881] [] (kthread) from [] (ret_from_fork+0x14/0x38) [ 183.795887] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c0046b84 [ 183.795889] r4:df70f580 --------------------------snip------------------------------------- Fixes: 57943716ff1b ("usb: gadget: composite: set our req->context to cdev") Signed-off-by: Florian Faber --- Change in v4: - Short commit hash - Fix line wrap Change in v3: - Addes changes Change in v2: - More verbose explanation - Added commit hash that introduced the bug drivers/usb/gadget/composite.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 504c1cbc255d..8d497be4be32 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -2518,6 +2518,7 @@ void usb_composite_setup_continue(struct usb_composite_dev *cdev) DBG(cdev, "%s: Completing delayed status\n", __func__); req->length = 0; req->context = cdev; + req->complete = composite_setup_complete; value = composite_ep0_queue(cdev, req, GFP_ATOMIC); if (value < 0) { DBG(cdev, "ep_queue --> %d\n", value); --