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| author | Jiri Kosina <jkosina@suse.cz> | 2014-08-27 09:12:24 +0200 |
|---|---|---|
| committer | Zefan Li <lizefan@huawei.com> | 2014-09-25 11:49:15 +0800 |
| commit | e115f02bda5dc98fc31cec1fe6160bcee887789c (patch) | |
| tree | 127d4fbbebace1a0be01a23aa7d620a4664cb314 | |
| parent | 0bfb000447ffec4e7245c9c761fd0770acba504d (diff) | |
| download | lwn-e115f02bda5dc98fc31cec1fe6160bcee887789c.tar.gz lwn-e115f02bda5dc98fc31cec1fe6160bcee887789c.zip | |
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>
| -rw-r--r-- | drivers/hid/hid-magicmouse.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c index 7cf3ffe4b7bc..81356f6f1580 100644 --- a/drivers/hid/hid-magicmouse.c +++ b/drivers/hid/hid-magicmouse.c @@ -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); |