From: Johan Hovold <johan@kernel.org>
Date: Wed, 4 Jul 2018 15:02:18 +0000 (+0200)
Subject: USB: serial: kobil_sct: fix modem-status error handling
X-Git-Tag: Ubuntu-4.15.0-56.62~1655
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=606cd7ee411868af14e677229520828a566a50b5;p=mirror_ubuntu-bionic-kernel.git

USB: serial: kobil_sct: fix modem-status error handling

BugLink: https://bugs.launchpad.net/bugs/1836287

[ Upstream commit a420b5d939ee58f1d950f0ea782834056520aeaa ]

Make sure to return -EIO in case of a short modem-status read request.

While at it, split the debug message to not include the (zeroed)
transfer-buffer content in case of errors.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
---

diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index a31ea7e194dd..a6ebed1e0f20 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -393,12 +393,20 @@ static int kobil_tiocmget(struct tty_struct *tty)
 			  transfer_buffer_length,
 			  KOBIL_TIMEOUT);
 
-	dev_dbg(&port->dev, "%s - Send get_status_line_state URB returns: %i. Statusline: %02x\n",
-		__func__, result, transfer_buffer[0]);
+	dev_dbg(&port->dev, "Send get_status_line_state URB returns: %i\n",
+			result);
+	if (result < 1) {
+		if (result >= 0)
+			result = -EIO;
+		goto out_free;
+	}
+
+	dev_dbg(&port->dev, "Statusline: %02x\n", transfer_buffer[0]);
 
 	result = 0;
 	if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0)
 		result = TIOCM_DSR;
+out_free:
 	kfree(transfer_buffer);
 	return result;
 }