linux-kernel - [PATCH 5.16 0246/1039] media: uvcvideo: Avoid returning invalid controls

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Date:   Mon, 24 Jan 2022 19:33:55 +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, Ricardo Ribalda <ribalda@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 0246/1039] media: uvcvideo: Avoid returning invalid controls

From: Ricardo Ribalda <ribalda@...omium.org>

[ Upstream commit 414d3b49d9fd4a0bb16a13d929027847fd094f3f ]

If the memory where ctrl_found is placed has the value of uvc_ctrl and
__uvc_find_control does not find the control we will return an invalid
index.

Fixes: 6350d6a4ed487 ("media: uvcvideo: Set error_idx during ctrl_commit errors")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 9a25d60292558..b4f6edf968bc0 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1639,7 +1639,7 @@ static int uvc_ctrl_find_ctrl_idx(struct uvc_entity *entity,
 				  struct uvc_control *uvc_control)
 {
 	struct uvc_control_mapping *mapping = NULL;
-	struct uvc_control *ctrl_found;
+	struct uvc_control *ctrl_found = NULL;
 	unsigned int i;
 
 	if (!entity)
-- 
2.34.1