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

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 <khoroshilov@ispras.ru>
Acked-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexey Khoroshilov 2014-04-12 02:10:45 +04:00 committed by Greg Kroah-Hartman
parent f9076e2801
commit 070c0b17f6
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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)) { if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
dev_err(&acm->control->dev, dev_err(&acm->control->dev,
"%s - usb_submit_urb(ctrl irq) failed\n", __func__); "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
usb_autopm_put_interface(acm->control);
goto error_submit_urb; goto error_submit_urb;
} }
acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS; acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
if (acm_set_control(acm, acm->ctrlout) < 0 && 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; goto error_set_control;
}
usb_autopm_put_interface(acm->control); usb_autopm_put_interface(acm->control);
@ -549,7 +552,6 @@ error_submit_read_urbs:
error_set_control: error_set_control:
usb_kill_urb(acm->ctrlurb); usb_kill_urb(acm->ctrlurb);
error_submit_urb: error_submit_urb:
usb_autopm_put_interface(acm->control);
error_get_interface: error_get_interface:
disconnected: disconnected:
mutex_unlock(&acm->mutex); mutex_unlock(&acm->mutex);