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media: uvcvideo: Don't expose unsupported formats to userspace 

When the uvcvideo driver encounters a format descriptor with an unknown
format GUID, it creates a corresponding struct uvc_format instance with
the fcc field set to 0. Since commit 50459f103e ("media: uvcvideo:
Remove format descriptions"), the driver relies on the V4L2 core to
provide the format description string, which the V4L2 core can't do
without a valid 4CC. This triggers a WARN_ON.

As a format with a zero 4CC can't be selected, it is unusable for
applications. Ignore the format completely without creating a uvc_format
instance, which fixes the warning.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217252
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2180107

Fixes: 50459f103e ("media: uvcvideo: Remove format descriptions")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Laurent Pinchart 2023-04-20 10:45:59 +01:00 committed by Mauro Carvalho Chehab
parent b37a356df8
commit 81f3affa19
1 changed files with 11 additions and 5 deletions
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16
drivers/media/usb/uvc/uvc_driver.c
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@ -251,14 +251,17 @@ static int uvc_parse_format(struct uvc_device *dev,
/* Find the format descriptor from its GUID. */
fmtdesc = uvc_format_by_guid(&buffer[5]);
if (fmtdesc != NULL) {
format->fcc = fmtdesc->fcc;
} else {
if (!fmtdesc) {
/*
* Unknown video formats are not fatal errors, the
* caller will skip this descriptor.
*/
dev_info(&streaming->intf->dev,
"Unknown video format %pUl\n", &buffer[5]);
format->fcc = 0;
return 0;
}
format->fcc = fmtdesc->fcc;
format->bpp = buffer[21];
/*
@ -675,7 +678,7 @@ static int uvc_parse_streaming(struct uvc_device *dev,
interval = (u32 *)&frame[nframes];
streaming->format = format;
streaming->nformats = nformats;
streaming->nformats = 0;
/* Parse the format descriptors. */
while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
@ -689,7 +692,10 @@ static int uvc_parse_streaming(struct uvc_device *dev,
&interval, buffer, buflen);
if (ret < 0)
goto error;
if (!ret)
break;
streaming->nformats++;
frame += format->nframes;
format++;