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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 9D5FBC7618F for ; Mon, 15 Jul 2019 13:56:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 76DD2217D8 for ; Mon, 15 Jul 2019 13:56:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563198987; bh=IJQp4JGWlGHtUhkSr7iEN/Tg3Vc0IOtwMeEeUGnLyS8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nsH1ST8sEcLw1pSlQDQkSSCTeHO3k2PFB+ff8W0HHt1q6dVg6TmpQLmjaiXdDesRN oKRyKQKItq81vxY6TK4XxomvqxyFYbdQgamhndiO27CAr2A9bV91/Tjtx5jmn+LJ8u 3NK8UJZDLRR4k39fx1eaFjixi2X9qBEtT4RNS7hk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732855AbfGON40 (ORCPT ); Mon, 15 Jul 2019 09:56:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:33108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732388AbfGON4Y (ORCPT ); Mon, 15 Jul 2019 09:56:24 -0400 Received: from sasha-vm.mshome.net (unknown [73.61.17.35]) (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 73BFF21841; Mon, 15 Jul 2019 13:56:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563198983; bh=IJQp4JGWlGHtUhkSr7iEN/Tg3Vc0IOtwMeEeUGnLyS8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ql1y/znU6eLoXR+0KZxHy5JHDT7CyQnMB8Yzc81hm1P00DRBIx3U5+FllWXeM8wBf Aubqmm037BSEyEtCGXWSK93tioUp0XkB2EpU118aNbXnKXP08tp18xz0EuqJcZ8sv8 LWBljxtGr/DosF0tvE2K5Anv2wchRAtUyw/fHvfo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lorenzo Bianconi , Jakub Kicinski , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.2 160/249] mt7601u: fix possible memory leak when the device is disconnected Date: Mon, 15 Jul 2019 09:45:25 -0400 Message-Id: <20190715134655.4076-160-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190715134655.4076-1-sashal@kernel.org> References: <20190715134655.4076-1-sashal@kernel.org> MIME-Version: 1.0 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: Lorenzo Bianconi [ Upstream commit 23377c200b2eb48a60d0f228b2a2e75ed6ee6060 ] When the device is disconnected while passing traffic it is possible to receive out of order urbs causing a memory leak since the skb linked to the current tx urb is not removed. Fix the issue deallocating the skb cleaning up the tx ring. Moreover this patch fixes the following kernel warning [ 57.480771] usb 1-1: USB disconnect, device number 2 [ 57.483451] ------------[ cut here ]------------ [ 57.483462] TX urb mismatch [ 57.483481] WARNING: CPU: 1 PID: 32 at drivers/net/wireless/mediatek/mt7601u/dma.c:245 mt7601u_complete_tx+0x165/00 [ 57.483483] Modules linked in: [ 57.483496] CPU: 1 PID: 32 Comm: kworker/1:1 Not tainted 5.2.0-rc1+ #72 [ 57.483498] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.12.0-2.fc30 04/01/2014 [ 57.483502] Workqueue: usb_hub_wq hub_event [ 57.483507] RIP: 0010:mt7601u_complete_tx+0x165/0x1e0 [ 57.483510] Code: 8b b5 10 04 00 00 8b 8d 14 04 00 00 eb 8b 80 3d b1 cb e1 00 00 75 9e 48 c7 c7 a4 ea 05 82 c6 05 f [ 57.483513] RSP: 0000:ffffc900000a0d28 EFLAGS: 00010092 [ 57.483516] RAX: 000000000000000f RBX: ffff88802c0a62c0 RCX: ffffc900000a0c2c [ 57.483518] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff810a8371 [ 57.483520] RBP: ffff88803ced6858 R08: 0000000000000000 R09: 0000000000000001 [ 57.483540] R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000046 [ 57.483542] R13: ffff88802c0a6c88 R14: ffff88803baab540 R15: ffff88803a0cc078 [ 57.483548] FS: 0000000000000000(0000) GS:ffff88803eb00000(0000) knlGS:0000000000000000 [ 57.483550] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.483552] CR2: 000055e7f6780100 CR3: 0000000028c86000 CR4: 00000000000006a0 [ 57.483554] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.483556] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.483559] Call Trace: [ 57.483561] [ 57.483565] __usb_hcd_giveback_urb+0x77/0xe0 [ 57.483570] xhci_giveback_urb_in_irq.isra.0+0x8b/0x140 [ 57.483574] handle_cmd_completion+0xf5b/0x12c0 [ 57.483577] xhci_irq+0x1f6/0x1810 [ 57.483581] ? lockdep_hardirqs_on+0x9e/0x180 [ 57.483584] ? _raw_spin_unlock_irq+0x24/0x30 [ 57.483588] __handle_irq_event_percpu+0x3a/0x260 [ 57.483592] handle_irq_event_percpu+0x1c/0x60 [ 57.483595] handle_irq_event+0x2f/0x4c [ 57.483599] handle_edge_irq+0x7e/0x1a0 [ 57.483603] handle_irq+0x17/0x20 [ 57.483607] do_IRQ+0x54/0x110 [ 57.483610] common_interrupt+0xf/0xf [ 57.483612] Acked-by: Jakub Kicinski Signed-off-by: Lorenzo Bianconi Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt7601u/dma.c | 21 ++++++++++++++++----- drivers/net/wireless/mediatek/mt7601u/tx.c | 4 ++-- 2 files changed, 18 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt7601u/dma.c b/drivers/net/wireless/mediatek/mt7601u/dma.c index 0faa3db6fde4..f6a0454abe04 100644 --- a/drivers/net/wireless/mediatek/mt7601u/dma.c +++ b/drivers/net/wireless/mediatek/mt7601u/dma.c @@ -233,14 +233,25 @@ static void mt7601u_complete_tx(struct urb *urb) struct sk_buff *skb; unsigned long flags; - spin_lock_irqsave(&dev->tx_lock, flags); + switch (urb->status) { + case -ECONNRESET: + case -ESHUTDOWN: + case -ENOENT: + return; + default: + dev_err_ratelimited(dev->dev, "tx urb failed: %d\n", + urb->status); + /* fall through */ + case 0: + break; + } - if (mt7601u_urb_has_error(urb)) - dev_err(dev->dev, "Error: TX urb failed:%d\n", urb->status); + spin_lock_irqsave(&dev->tx_lock, flags); if (WARN_ONCE(q->e[q->start].urb != urb, "TX urb mismatch")) goto out; skb = q->e[q->start].skb; + q->e[q->start].skb = NULL; trace_mt_tx_dma_done(dev, skb); __skb_queue_tail(&dev->tx_skb_done, skb); @@ -440,10 +451,10 @@ static void mt7601u_free_tx_queue(struct mt7601u_tx_queue *q) { int i; - WARN_ON(q->used); - for (i = 0; i < q->entries; i++) { usb_poison_urb(q->e[i].urb); + if (q->e[i].skb) + mt7601u_tx_status(q->dev, q->e[i].skb); usb_free_urb(q->e[i].urb); } } diff --git a/drivers/net/wireless/mediatek/mt7601u/tx.c b/drivers/net/wireless/mediatek/mt7601u/tx.c index 906e19c5f628..f3dff8319a4c 100644 --- a/drivers/net/wireless/mediatek/mt7601u/tx.c +++ b/drivers/net/wireless/mediatek/mt7601u/tx.c @@ -109,9 +109,9 @@ void mt7601u_tx_status(struct mt7601u_dev *dev, struct sk_buff *skb) info->status.rates[0].idx = -1; info->flags |= IEEE80211_TX_STAT_ACK; - spin_lock(&dev->mac_lock); + spin_lock_bh(&dev->mac_lock); ieee80211_tx_status(dev->hw, skb); - spin_unlock(&dev->mac_lock); + spin_unlock_bh(&dev->mac_lock); } static int mt7601u_skb_rooms(struct mt7601u_dev *dev, struct sk_buff *skb) -- 2.20.1