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| author | Stephan Lachowsky <stephan.lachowsky@maxim-ic.com> | 2011-01-27 23:04:33 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-27 11:36:10 -0700 |
| commit | fa957c169f0d20b9178d9a1b4eff55525d254d4d (patch) | |
| tree | ff71dcb426056ced7d62721ae11af4d882398086 | |
| parent | c94fc399adb5206b7634567fc84df2d9c2e110c5 (diff) | |
| download | lwn-fa957c169f0d20b9178d9a1b4eff55525d254d4d.tar.gz lwn-fa957c169f0d20b9178d9a1b4eff55525d254d4d.zip | |
uvcvideo: Fix uvc_fixup_video_ctrl() format search
commit 38a66824d96de8aeeb915e6f46f0d3fe55828eb1 upstream.
The scheme used to index format in uvc_fixup_video_ctrl() is not robust:
format index is based on descriptor ordering, which does not necessarily
match bFormatIndex ordering. Searching for first matching format will
prevent uvc_fixup_video_ctrl() from using the wrong format/frame to make
adjustments.
Signed-off-by: Stephan Lachowsky <stephan.lachowsky@maxim-ic.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/media/video/uvc/uvc_video.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c index 5673d673504b..545c0294813d 100644 --- a/drivers/media/video/uvc/uvc_video.c +++ b/drivers/media/video/uvc/uvc_video.c @@ -89,15 +89,19 @@ int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, static void uvc_fixup_video_ctrl(struct uvc_streaming *stream, struct uvc_streaming_control *ctrl) { - struct uvc_format *format; + struct uvc_format *format = NULL; struct uvc_frame *frame = NULL; unsigned int i; - if (ctrl->bFormatIndex <= 0 || - ctrl->bFormatIndex > stream->nformats) - return; + for (i = 0; i < stream->nformats; ++i) { + if (stream->format[i].index == ctrl->bFormatIndex) { + format = &stream->format[i]; + break; + } + } - format = &stream->format[ctrl->bFormatIndex - 1]; + if (format == NULL) + return; for (i = 0; i < format->nframes; ++i) { if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) { |