Received-SPF: pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Chi-Hsien Lin <chi-hsien.lin@cypress.com>
To:     linux-wireless@vger.kernel.org
Cc:     brcm80211-dev-list@broadcom.com, brcm80211-dev-list@cypress.com,
        Arend van Spriel <arend.vanspriel@broadcom.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Wright Feng <wright.feng@cypress.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Raveendran Somu <raveendran.somu@cypress.com>,
        Chi-hsien Lin <chi-hsien.lin@cypress.com>
Subject: [PATCH 1/6] brcmfmac: Fix driver crash on USB control transfer timeout
Date:   Thu, 13 Feb 2020 02:44:31 -0600
Message-Id: <1581583476-60155-2-git-send-email-chi-hsien.lin@cypress.com>
In-Reply-To: <1581583476-60155-1-git-send-email-chi-hsien.lin@cypress.com>
References: <1581583476-60155-1-git-send-email-chi-hsien.lin@cypress.com>
Content-Type: text/plain
MIME-Version: 1.0
Received-SPF: None (protection.outlook.com: cypress.com does not designate
 permitted sender hosts)
X-MS-Exchange-CrossTenant-Network-Message-Id: 13e9e2eb-2ee1-4c1b-91d9-08d7b0610c1e
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2020 08:45:16.2668
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 011addfc-2c09-450d-8938-e0bbc2dd2376
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: X7n/0Nq7ynr/inSdq0ZvS2ZoYk+3YcwwMiWWElTyMiEjN+0saYnamvICNCMM+EF2XSooSzjoYqeM+06V1MQbgQ==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR06MB5623
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-wireless.vger.kernel.org>
X-Mailing-List: linux-wireless@vger.kernel.org

From: Raveendran Somu <raveendran.somu@cypress.com>

When the control transfer gets timed out, the error status
was returned without killing that urb, this leads to using
the same urb. This issue causes the kernel crash as the same
urb is sumbitted multiple times. The fix is to kill the
urb for timeout transfer before returning error

Signed-off-by: Raveendran Somu <raveendran.somu@cypress.com>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
index 575ed19e9195..10387a7f5d56 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
@@ -328,11 +328,12 @@ static int brcmf_usb_tx_ctlpkt(struct device *dev, u8 *buf, u32 len)
 		return err;
 	}
 	timeout = brcmf_usb_ioctl_resp_wait(devinfo);
-	clear_bit(0, &devinfo->ctl_op);
 	if (!timeout) {
 		brcmf_err("Txctl wait timed out\n");
+		usb_kill_urb(devinfo->ctl_urb);
 		err = -EIO;
 	}
+	clear_bit(0, &devinfo->ctl_op);
 	return err;
 }
 
@@ -358,11 +359,12 @@ static int brcmf_usb_rx_ctlpkt(struct device *dev, u8 *buf, u32 len)
 	}
 	timeout = brcmf_usb_ioctl_resp_wait(devinfo);
 	err = devinfo->ctl_urb_status;
-	clear_bit(0, &devinfo->ctl_op);
 	if (!timeout) {
 		brcmf_err("rxctl wait timed out\n");
+		usb_kill_urb(devinfo->ctl_urb);
 		err = -EIO;
 	}
+	clear_bit(0, &devinfo->ctl_op);
 	if (!err)
 		return devinfo->ctl_urb_actual_length;
 	else
-- 
2.1.0