diff options
| author |   Anirudh Rayabharam <mail@anirudhrb.com> | 2021-06-24 00:10:29 +0530 |
|---|---|---|
| committer |   Jiri Kosina <jkosina@suse.cz> | 2021-07-28 11:31:40 +0200 |
| commit | f7744fa16b96da57187dc8e5634152d3b63d72de (patch) | |
| tree | fea444cb011feead7cfb79ed76489c46c3342f0a | |
| parent | HID: input: do not report stylus battery state as "full" (diff) | |
| download | linux-dev-f7744fa16b96da57187dc8e5634152d3b63d72de.tar.xz linux-dev-f7744fa16b96da57187dc8e5634152d3b63d72de.zip | |
HID: usbhid: free raw_report buffers in usbhid_stop
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>
| -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 06130dc431a0..0bf123bf2ef8 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -505,7 +505,7 @@ 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 && @@ -1223,9 +1223,20 @@ 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); |