linux-kernel - [PATCH 5.4 09/88] HID: bigbenff: prevent null pointer dereference

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Message-Id: <20211213092933.551227122@linuxfoundation.org>
Date:   Mon, 13 Dec 2021 10:29:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH 5.4 09/88] HID: bigbenff: prevent null pointer dereference

From: Benjamin Tissoires <benjamin.tissoires@...hat.com>

commit 918aa1ef104d286d16b9e7ef139a463ac7a296f0 upstream.

When emulating the device through uhid, there is a chance we don't have
output reports and so report_field is null.

Cc: stable@...r.kernel.org
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Link: https://lore.kernel.org/r/20211202095334.14399-3-benjamin.tissoires@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/hid/hid-bigbenff.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hid/hid-bigbenff.c
+++ b/drivers/hid/hid-bigbenff.c
@@ -191,7 +191,7 @@ static void bigben_worker(struct work_st
 		struct bigben_device, worker);
 	struct hid_field *report_field = bigben->report->field[0];
 
-	if (bigben->removed)
+	if (bigben->removed || !report_field)
 		return;
 
 	if (bigben->work_led) {