[PATCH 3.16 072/148] appledisplay: fix error handling in the scheduled work

Ben Hutchings
2020-02-08T18:35:50Z

From: Oliver Neukum <oneukum@suse.com>

commit 91feb01596e5efc0cc922cc73f5583114dccf4d2 upstream.

The work item can operate on

1. stale memory left over from the last transfer
the actual length of the data transfered needs to be checked
2. memory already freed
the error handling in appledisplay_probe() needs
to cancel the work in that case

Reported-and-tested-by: syzbot+495dab1f175edc9c2f13@syzkaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20191106124902.7765-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/usb/misc/appledisplay.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/usb/misc/appledisplay.c
+++ b/drivers/usb/misc/appledisplay.c
@@ -180,7 +180,12 @@ static int appledisplay_bl_get_brightnes
0,
pdata->msgdata, 2,
ACD_USB_TIMEOUT);
- brightness = pdata->msgdata[1];
+ if (retval < 2) {
+ if (retval >= 0)
+ retval = -EMSGSIZE;
+ } else {
+ brightness = pdata->msgdata[1];
+ }
mutex_unlock(&pdata->sysfslock);

if (retval < 0)
@@ -326,6 +331,7 @@ error:
if (pdata) {
if (pdata->urb) {
usb_kill_urb(pdata->urb);
+ cancel_delayed_work_sync(&pdata->work);
if (pdata->urbdata)
usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
pdata->urbdata, pdata->urb->transfer_dma);