diff options
| -rw-r--r-- | drivers/media/usb/uvc/uvc_driver.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index 428235ca2635..2b688cc39bb8 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1493,6 +1493,11 @@ static int uvc_scan_chain_forward(struct uvc_video_chain *chain, break; if (forward == prev) continue; + if (forward->chain.next || forward->chain.prev) { + uvc_trace(UVC_TRACE_DESCR, "Found reference to " + "entity %d already in chain.\n", forward->id); + return -EINVAL; + } switch (UVC_ENTITY_TYPE(forward)) { case UVC_VC_EXTENSION_UNIT: @@ -1574,6 +1579,13 @@ static int uvc_scan_chain_backward(struct uvc_video_chain *chain, return -1; } + if (term->chain.next || term->chain.prev) { + uvc_trace(UVC_TRACE_DESCR, "Found reference to " + "entity %d already in chain.\n", + term->id); + return -EINVAL; + } + if (uvc_trace_param & UVC_TRACE_PROBE) printk(KERN_CONT " %d", term->id); |