s.c
+++ b/drivers/hid/hid-prodikeys.c
@@ -378,6 +378,10 @@ static int pcmidi_handle_report4(struct pcmidi_snd *pm, u8 *data)
 	bit_mask = (bit_mask << 8) | data[2];
 	bit_mask = (bit_mask << 8) | data[3];
 
+	/* robustness in case input_mapping hook does not get called */
+	if (!pm->input_ep82)
+		return 0;
+
 	/* break keys */
 	for (bit_index = 0; bit_index < 24; bit_index++) {
 		if (!((0x01 << bit_index) & bit_mask)) {
-- 
2.51.0[PATCH 6.19 562/844] HID: prodikeys: Check presence of pm->input_ep82Sasha Levin <sashal@kernel.org> undefinedlinux-kernel@vger.kernel.org, stable@vger.kernel.org undefined undefined undefined undefined”V†¬