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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 7A4D1C282CE for ; Tue, 4 Jun 2019 23:26:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4D97A206C1 for ; Tue, 4 Jun 2019 23:26:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559690808; bh=TRhb4bn5sZlQ1o7SrEF3J/f2N5alQl++5ijQez+ggKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=toCjdMwNAbFep2tylSK2AAQOGPM/ztkDabiH/M8EAtUjZkWHromleNTEYPfI5S8OY v62GB/oTZas5WzC6PjlhC9XtCNfPZKH9+Fq3nxCDOKOTLTJjHQ2UXJ6JFFQBxG5Apj 72wtwkjwlBPET1Tx0rWiGnZWHxh3KcocSQaCalcQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727954AbfFDXZa (ORCPT ); Tue, 4 Jun 2019 19:25:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:37260 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728012AbfFDXZa (ORCPT ); Tue, 4 Jun 2019 19:25:30 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DABE12085A; Tue, 4 Jun 2019 23:25:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559690728; bh=TRhb4bn5sZlQ1o7SrEF3J/f2N5alQl++5ijQez+ggKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X7dAFa301wbOeAptVNGitfi2KdpbzErm1z949HoogjT48hSx8M4a/XJsjwDo3yO1n m6ukr29VwlN/ZX2EB2i7FHijWgwDiHfSpXfaIKkXb+i2I5kMtsSsfMHEOcF0SrAceL JeTH7PwABwVwhCC17MmCOzfZ7EB1GHHHFPYuhZsc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kloetzke Jan , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org, linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 15/17] usbnet: fix kernel crash after disconnect Date: Tue, 4 Jun 2019 19:24:56 -0400 Message-Id: <20190604232459.7745-15-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190604232459.7745-1-sashal@kernel.org> References: <20190604232459.7745-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Kloetzke Jan [ Upstream commit ad70411a978d1e6e97b1e341a7bde9a79af0c93d ] When disconnecting cdc_ncm the kernel sporadically crashes shortly after the disconnect: [ 57.868812] Unable to handle kernel NULL pointer dereference at virtual address 00000000 ... [ 58.006653] PC is at 0x0 [ 58.009202] LR is at call_timer_fn+0xec/0x1b4 [ 58.013567] pc : [<0000000000000000>] lr : [] pstate: 00000145 [ 58.020976] sp : ffffff8008003da0 [ 58.024295] x29: ffffff8008003da0 x28: 0000000000000001 [ 58.029618] x27: 000000000000000a x26: 0000000000000100 [ 58.034941] x25: 0000000000000000 x24: ffffff8008003e68 [ 58.040263] x23: 0000000000000000 x22: 0000000000000000 [ 58.045587] x21: 0000000000000000 x20: ffffffc68fac1808 [ 58.050910] x19: 0000000000000100 x18: 0000000000000000 [ 58.056232] x17: 0000007f885aff8c x16: 0000007f883a9f10 [ 58.061556] x15: 0000000000000001 x14: 000000000000006e [ 58.066878] x13: 0000000000000000 x12: 00000000000000ba [ 58.072201] x11: ffffffc69ff1db30 x10: 0000000000000020 [ 58.077524] x9 : 8000100008001000 x8 : 0000000000000001 [ 58.082847] x7 : 0000000000000800 x6 : ffffff8008003e70 [ 58.088169] x5 : ffffffc69ff17a28 x4 : 00000000ffff138b [ 58.093492] x3 : 0000000000000000 x2 : 0000000000000000 [ 58.098814] x1 : 0000000000000000 x0 : 0000000000000000 ... [ 58.205800] [< (null)>] (null) [ 58.210521] [] expire_timers+0xa0/0x14c [ 58.215937] [] run_timer_softirq+0xe8/0x128 [ 58.221702] [] __do_softirq+0x298/0x348 [ 58.227118] [] irq_exit+0x74/0xbc [ 58.232009] [] __handle_domain_irq+0x78/0xac [ 58.237857] [] gic_handle_irq+0x80/0xac ... The crash happens roughly 125..130ms after the disconnect. This correlates with the 'delay' timer that is started on certain USB tx/rx errors in the URB completion handler. The problem is a race of usbnet_stop() with usbnet_start_xmit(). In usbnet_stop() we call usbnet_terminate_urbs() to cancel all URBs in flight. This only makes sense if no new URBs are submitted concurrently, though. But the usbnet_start_xmit() can run at the same time on another CPU which almost unconditionally submits an URB. The error callback of the new URB will then schedule the timer after it was already stopped. The fix adds a check if the tx queue is stopped after the tx list lock has been taken. This should reliably prevent the submission of new URBs while usbnet_terminate_urbs() does its job. The same thing is done on the rx side even though it might be safe due to other flags that are checked there. Signed-off-by: Jan Klötzke Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/usb/usbnet.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 4ab82b998a0f..a5acbcb3c044 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -508,6 +508,7 @@ static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) if (netif_running (dev->net) && netif_device_present (dev->net) && + test_bit(EVENT_DEV_OPEN, &dev->flags) && !test_bit (EVENT_RX_HALT, &dev->flags) && !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { @@ -1394,6 +1395,11 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, spin_unlock_irqrestore(&dev->txq.lock, flags); goto drop; } + if (netif_queue_stopped(net)) { + usb_autopm_put_interface_async(dev->intf); + spin_unlock_irqrestore(&dev->txq.lock, flags); + goto drop; + } #ifdef CONFIG_PM /* if this triggers the device is still a sleep */ -- 2.20.1