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Date: Mon, 4 Oct 2021 14:53:27 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, syzbot+47b26cd837ececfc666d@...kaller.appspotmail.com, Anirudh Rayabharam <mail@...rudhrb.com>, Jiri Kosina <jkosina@...e.cz> Subject: [PATCH 5.10 89/93] HID: usbhid: free raw_report buffers in usbhid_stop From: Anirudh Rayabharam <mail@...rudhrb.com> 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@...kaller.appspotmail.com Tested-by: syzbot+47b26cd837ececfc666d@...kaller.appspotmail.com Signed-off-by: Anirudh Rayabharam <mail@...rudhrb.com> Signed-off-by: Jiri Kosina <jkosina@...e.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/hid/usbhid/hid-core.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) --- 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_devic 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);
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