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HID: magicmouse: sanity check report size in raw_event() callback 

commit c54def7bd64d7c0b6993336abcffb8444795bf38 upstream.

The report passed to us from transport driver could potentially be
arbitrarily large, therefore we better sanity-check it so that
magicmouse_emit_touch() gets only valid values of raw_id.

Reported-by: Steven Vittitoe <scvitti@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Jiri Kosina 2014-08-27 09:12:24 +02:00 committed by Zefan Li
parent 0bfb000447
commit e115f02bda
1 changed files with 10 additions and 0 deletions
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10
drivers/hid/hid-magicmouse.c
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@ -308,6 +308,11 @@ static int magicmouse_raw_event(struct hid_device *hdev,
if (size < 4 || ((size - 4) % 9) != 0)
return 0;
npoints = (size - 4) / 9;
if (npoints > 15) {
hid_warn(hdev, "invalid size value (%d) for TRACKPAD_REPORT_ID\n",
size);
return 0;
}
msc->ntouches = 0;
for (ii = 0; ii < npoints; ii++)
magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
@ -331,6 +336,11 @@ static int magicmouse_raw_event(struct hid_device *hdev,
if (size < 6 || ((size - 6) % 8) != 0)
return 0;
npoints = (size - 6) / 8;
if (npoints > 15) {
hid_warn(hdev, "invalid size value (%d) for MOUSE_REPORT_ID\n",
size);
return 0;
}
msc->ntouches = 0;
for (ii = 0; ii < npoints; ii++)
magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);