diff options
| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-09-01 16:12:10 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-26 08:35:08 +0200 |
| commit | b8b53adeca0e3ce18663338deb632b41c43a5176 (patch) | |
| tree | 577c736ed135e2dab67c1c7c75af123541c704e9 | |
| parent | 4be36bccc6c59b7482398a9db4c4df84f0a944af (diff) | |
usb: cdc-wdm: Fix a sleep-in-atomic-context bug in service_outstanding_interrupt()
commit 6e22e3af7bb3a7b9dc53cb4687659f6e63fca427 upstream.
wdm_in_callback() is a completion handler function for the USB driver.
So it should not sleep. But it calls service_outstanding_interrupt(),
which calls usb_submit_urb() with GFP_KERNEL.
To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC.
This bug is found by my static analysis tool DSAC.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/class/cdc-wdm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 61ea87917433..4380e4f600ab 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -453,7 +453,7 @@ static int clear_wdm_read_flag(struct wdm_device *desc) set_bit(WDM_RESPONDING, &desc->flags); spin_unlock_irq(&desc->iuspin); - rv = usb_submit_urb(desc->response, GFP_KERNEL); + rv = usb_submit_urb(desc->response, GFP_ATOMIC); spin_lock_irq(&desc->iuspin); if (rv) { dev_err(&desc->intf->dev, |