diff options
| author | Anirudh Rayabharam <mail@anirudhrb.com> | 2021-06-24 00:10:29 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-06 15:42:39 +0200 |
| commit | 965147067fa1bedff3ae1f07ce3f89f1a14d2df3 (patch) | |
| tree | 2d459b712f935d106adc5a7c528c9648ed123ef5 | |
| parent | 6f2f68640b8478b3bd385bc541ee517d7bdddf76 (diff) | |
HID: usbhid: free raw_report buffers in usbhid_stop
commit f7744fa16b96da57187dc8e5634152d3b63d72de upstream.
Free the unsent raw_report buffers when the device is removed.
Fixes a memory leak reported by syzbot at:
https://syzkaller.appspot.com/bug?id=7b4fa7cb1a7c2d3342a2a8a6c53371c8c418ab47
Reported-by: syzbot+47b26cd837ececfc666d@syzkaller.appspotmail.com
Tested-by: syzbot+47b26cd837ececfc666d@syzkaller.appspotmail.com
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/hid/usbhid/hid-core.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index 1cfbbaf6901d..8537fcdb456d 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -503,7 +503,7 @@ static void hid_ctrl(struct urb *urb) if (unplug) { usbhid->ctrltail = usbhid->ctrlhead; - } else { + } else if (usbhid->ctrlhead != usbhid->ctrltail) { usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1); if (usbhid->ctrlhead != usbhid->ctrltail && @@ -1221,9 +1221,20 @@ static void usbhid_stop(struct hid_device *hid) mutex_lock(&usbhid->mutex); clear_bit(HID_STARTED, &usbhid->iofl); + spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */ set_bit(HID_DISCONNECTED, &usbhid->iofl); + while (usbhid->ctrltail != usbhid->ctrlhead) { + if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_OUT) { + kfree(usbhid->ctrl[usbhid->ctrltail].raw_report); + usbhid->ctrl[usbhid->ctrltail].raw_report = NULL; + } + + usbhid->ctrltail = (usbhid->ctrltail + 1) & + (HID_CONTROL_FIFO_SIZE - 1); + } spin_unlock_irq(&usbhid->lock); + usb_kill_urb(usbhid->urbin); usb_kill_urb(usbhid->urbout); usb_kill_urb(usbhid->urbctrl); |