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-rw-r--r--drivers/hid/hid-wiimote-core.c10
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 */
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