[PATCH 1/2] HID: magicmouse: sanity check report size in raw_event() callback
From: Jiri Kosina <hidden>
Date: 2014-08-27 07:12:28
Also in:
lkml
Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
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. Cc: stable@vger.kernel.org Reported-by: Steven Vittitoe <redacted> Signed-off-by: Jiri Kosina <redacted> --- drivers/hid/hid-magicmouse.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index ecc2cbf..29a74c1 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c@@ -290,6 +290,11 @@ 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);
@@ -307,6 +312,11 @@ 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);
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1.9.2