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 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,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 51EF2C43219 for ; Thu, 9 Sep 2021 12:55:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3CA64611AD for ; Thu, 9 Sep 2021 12:55:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354297AbhIIM46 (ORCPT ); Thu, 9 Sep 2021 08:56:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:41082 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354445AbhIIMvK (ORCPT ); Thu, 9 Sep 2021 08:51:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0B8BD63245; Thu, 9 Sep 2021 11:57:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631188627; bh=wN6vSEPhPLmzIulhSS4Va0sPao8QvE+7Z2WVoHmIeuc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jriL5Z8sS67u73PFj9Wk02Myigy28wvudviTSnliTaciYPw46Z1h5uzuO7U2QKvl2 IRCA+IexZxZglpSHNanUCOi3eVrT4D3GJoUoAStivLiRs+9hV7U33vbzxfS5TQmnPe gXgrpPcSFv427n0SRcDqQTrypBmj9KQHAn/5XD3UR2m4+oOfsO1mSsLC/ItTNHFgMD mzWoP0GBV7D4kMg3YJSfN7tdM2aZlydFYv6theSpOCoyslFX+QTem1qLYH+FNNd/wm g26VyHRfBINVOJGA4Ro0UJb73D11KpusyF8x8i3yYmape8U3swT3jI1YwEA7oYPliH b6tV+RdNM3GwA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Anirudh Rayabharam , syzbot+74d6ef051d3d2eacf428@syzkaller.appspotmail.com, Shuah Khan , Greg Kroah-Hartman , Sasha Levin , linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 095/109] usbip: give back URBs for unsent unlink requests during cleanup Date: Thu, 9 Sep 2021 07:54:52 -0400 Message-Id: <20210909115507.147917-95-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210909115507.147917-1-sashal@kernel.org> References: <20210909115507.147917-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Anirudh Rayabharam [ Upstream commit 258c81b341c8025d79073ce2d6ce19dcdc7d10d2 ] In vhci_device_unlink_cleanup(), the URBs for unsent unlink requests are not given back. This sometimes causes usb_kill_urb to wait indefinitely for that urb to be given back. syzbot has reported a hung task issue [1] for this. To fix this, give back the urbs corresponding to unsent unlink requests (unlink_tx list) similar to how urbs corresponding to unanswered unlink requests (unlink_rx list) are given back. [1]: https://syzkaller.appspot.com/bug?id=08f12df95ae7da69814e64eb5515d5a85ed06b76 Reported-by: syzbot+74d6ef051d3d2eacf428@syzkaller.appspotmail.com Tested-by: syzbot+74d6ef051d3d2eacf428@syzkaller.appspotmail.com Reviewed-by: Shuah Khan Signed-off-by: Anirudh Rayabharam Link: https://lore.kernel.org/r/20210820190122.16379-2-mail@anirudhrb.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/usbip/vhci_hcd.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c index 98636fbf7188..46a46cde2070 100644 --- a/drivers/usb/usbip/vhci_hcd.c +++ b/drivers/usb/usbip/vhci_hcd.c @@ -952,8 +952,32 @@ static void vhci_device_unlink_cleanup(struct vhci_device *vdev) spin_lock(&vdev->priv_lock); list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) { + struct urb *urb; + + /* give back urb of unsent unlink request */ pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum); + + urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); + if (!urb) { + list_del(&unlink->list); + kfree(unlink); + continue; + } + + urb->status = -ENODEV; + + usb_hcd_unlink_urb_from_ep(hcd, urb); + list_del(&unlink->list); + + spin_unlock(&vdev->priv_lock); + spin_unlock_irqrestore(&vhci->lock, flags); + + usb_hcd_giveback_urb(hcd, urb, urb->status); + + spin_lock_irqsave(&vhci->lock, flags); + spin_lock(&vdev->priv_lock); + kfree(unlink); } -- 2.30.2