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USB: cdc-acm: fix double usb_autopm_put_interface() in acm_port_activate()

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If acm_submit_read_urbs() fails in acm_port_activate(), error handling
code calls usb_autopm_put_interface() while it is already called
before acm_submit_read_urbs(). The patch reorganizes error handling code
to avoid double decrement of USB interface's PM-usage counter.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <[email protected]>
Acked-by: Oliver Neukum <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Alexey Khoroshilov 2014-04-12 02:10:45 +04:00 • committed by Greg Kroah-Hartman
commit 070c0b17f6
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/class/cdc-acm.c
View file

@ -518,13 +518,16 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
dev_err(&acm->control->dev,
"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
usb_autopm_put_interface(acm->control);
goto error_submit_urb;
}
acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
if (acm_set_control(acm, acm->ctrlout) < 0 &&
(acm->ctrl_caps & USB_CDC_CAP_LINE))
(acm->ctrl_caps & USB_CDC_CAP_LINE)) {
usb_autopm_put_interface(acm->control);
goto error_set_control;
}
usb_autopm_put_interface(acm->control);
@ -549,7 +552,6 @@ error_submit_read_urbs:
error_set_control:
usb_kill_urb(acm->ctrlurb);
error_submit_urb:
usb_autopm_put_interface(acm->control);
error_get_interface:
disconnected:
mutex_unlock(&acm->mutex);