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| author | David Herrmann <dh.herrmann@gmail.com> | 2013-05-26 22:55:03 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2013-06-03 11:07:07 +0200 |
| commit | 876727eabf3f224beb5f9b3bbcec2fb891faa89d (patch) | |
| tree | d53ca742c2ac7c1af4ecbf48250d794a77885c01 /drivers/hid/hid-wiimote-core.c | |
| parent | ee286c2e80547d87ed4e55c00709783aa2261848 (diff) | |
| download | blackbird-op-linux-876727eabf3f224beb5f9b3bbcec2fb891faa89d.tar.gz blackbird-op-linux-876727eabf3f224beb5f9b3bbcec2fb891faa89d.zip | |
HID: wiimote: discard invalid EXT data reports
If an extension device isn't initialized properly, or during hardware
initialization, a device might send extension data which is all 0xff.
This is ambigious because this is also a valid normal data report. But
it is impossible, under normal conditions, to trigger valid reports with
all 0xff. Hence, we can safely ignore them.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-wiimote-core.c')
| -rw-r--r-- | drivers/hid/hid-wiimote-core.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c index ea00030defd6..e0ac84b2f74b 100644 --- a/drivers/hid/hid-wiimote-core.c +++ b/drivers/hid/hid-wiimote-core.c @@ -1276,11 +1276,19 @@ static bool valid_ext_handler(const struct wiimod_ops *ops, size_t len) static void handler_ext(struct wiimote_data *wdata, const __u8 *payload, size_t len) { + static const __u8 invalid[21] = { 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, + 0xff }; const __u8 *iter, *mods; const struct wiimod_ops *ops; bool is_mp; - if (len < 6) + if (len > 21) + len = 21; + if (len < 6 || !memcmp(payload, invalid, len)) return; /* if MP is active, track MP slot hotplugging */ |
