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| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2014-04-12 02:10:45 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-16 13:56:08 -0700 |
| commit | 070c0b17f6a1ba39dff9be112218127e7e8fd456 (patch) | |
| tree | 234e8b760c190f6a93a8f8de0776aaf2e93f5cd0 /drivers/usb | |
| parent | f9076e28013e448ba2a905ae905ac9b53f8a2e16 (diff) | |
| download | linux-stable-070c0b17f6a1ba39dff9be112218127e7e8fd456.tar.gz linux-stable-070c0b17f6a1ba39dff9be112218127e7e8fd456.tar.bz2 linux-stable-070c0b17f6a1ba39dff9be112218127e7e8fd456.zip | |
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>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 900f7ff805ee..d5d2c922186a 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -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); |