* [PATCH] media: uvcvideo: Fix loop exit condition in uvc_xu_ctrl_query()
@ 2020-06-26 10:45 Dan Carpenter
0 siblings, 0 replies; only message in thread
From: Dan Carpenter @ 2020-06-26 10:45 UTC (permalink / raw)
To: Laurent Pinchart; +Cc: Mauro Carvalho Chehab, linux-media, kernel-janitors
The list_for_each_entry() loop exits when "entity" is a offset off the
list head. In that situation the "entity" pointer doesn't point to a
valid uvc_entity struct, so it doesn't make sense to check "entity->id".
Since the "entity->id" is a u8 it's plausible that it could be equal to
"xqry->unit" by chance.
Fixes: c0efd232929c ("V4L/DVB (8145a): USB Video Class driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
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 e399b9fad757..47ab6c315db6 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1857,7 +1857,7 @@ int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
break;
}
- if (entity->id != xqry->unit) {
+ if (&entity->chain == &chain->entities) {
uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
xqry->unit);
return -ENOENT;
--
2.27.0
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2020-06-26 10:45 [PATCH] media: uvcvideo: Fix loop exit condition in uvc_xu_ctrl_query() Dan Carpenter
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