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USB: serial: mos7720: fix use-after-free on probe errors

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The interrupt URB was submitted on probe but never stopped on probe
errors. This can lead to use-after-free issues in the completion
handler when accessing the freed usb-serial struct:

Unable to handle kernel paging request at virtual address 6b6b6be7
...
[<bf052e70>] (mos7715_interrupt_callback [mos7720]) from [<c052a894>] (__usb_hcd_giveback_urb+0x80/0x140)
[<c052a894>] (__usb_hcd_giveback_urb) from [<c052a9a4>] (usb_hcd_giveback_urb+0x50/0x138)
[<c052a9a4>] (usb_hcd_giveback_urb) from [<c0550684>] (musb_giveback+0xc8/0x1cc)

Fixes: b69578df7e ("USB: usbserial: mos7720: add support for parallel
port on moschip 7715")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-01-03 16:39:51 +01:00
parent b05aebc25f
commit 91a1ff4d53
1 changed files with 5 additions and 1 deletions
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6
drivers/usb/serial/mos7720.c
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@ -1962,8 +1962,10 @@ static int mos7720_startup(struct usb_serial *serial)
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
if (product == MOSCHIP_DEVICE_ID_7715) {
ret_val = mos7715_parport_init(serial);
if (ret_val < 0)
if (ret_val < 0) {
usb_kill_urb(serial->port[0]->interrupt_in_urb);
return ret_val;
}
}
#endif
/* LSR For Port 1 */
@ -1975,6 +1977,8 @@ static int mos7720_startup(struct usb_serial *serial)
static void mos7720_release(struct usb_serial *serial)
{
usb_kill_urb(serial->port[0]->interrupt_in_urb);
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
/* close the parallel port */