linux-kernel - [PATCH] media: uvc: Handle cameras with invalid descriptors

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Message-Id: <20220328205952.584407-1-ribalda@chromium.org>
Date:   Mon, 28 Mar 2022 22:59:52 +0200
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda <ribalda@...omium.org>,
        syzbot <syzkaller@...glegroups.com>
Subject: [PATCH] media: uvc: Handle cameras with invalid descriptors

If the source entity does not contain any pads, do not create a link.

Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_entity.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_entity.c b/drivers/media/usb/uvc/uvc_entity.c
index 7c4d2f93d351..1f730cb72e58 100644
--- a/drivers/media/usb/uvc/uvc_entity.c
+++ b/drivers/media/usb/uvc/uvc_entity.c
@@ -43,7 +43,7 @@ static int uvc_mc_create_links(struct uvc_video_chain *chain,
 		source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING)
 		       ? (remote->vdev ? &remote->vdev->entity : NULL)
 		       : &remote->subdev.entity;
-		if (source == NULL)
+		if (source == NULL || source->num_pads == 0)
 			continue;
 
 		remote_pad = remote->num_pads - 1;
-- 
2.35.1.1021.g381101b075-goog