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gstv4l2tuner: return NULL if no norm set

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If the video4linux device supports norms but has no norm set, norm is
returned as an uninitialized variable after the ioctl call, leading to
gst_v4l2_tuner_get_norm_by_std_id() returning a random norm from the
supported norms. Catch this case and instead return NULL to indicate
that no norm is setup.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1758>
This commit is contained in:
Rouven Czerwinski 2022-02-02 12:49:29 +01:00 committed by GStreamer Marge Bot
parent dbd60f9cbf
commit 5911ee26a5
1 changed files with 2 additions and 1 deletions
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subprojects/gst-plugins-good/sys/v4l2/gstv4l2tuner.c
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@ -181,7 +181,8 @@ gst_v4l2_tuner_get_norm (GstV4l2Object * v4l2object)
/* assert that we're opened and that we're using a known item */ /* assert that we're opened and that we're using a known item */
g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2object), NULL); g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2object), NULL);
gst_v4l2_get_norm (v4l2object, &norm); if (!gst_v4l2_get_norm (v4l2object, &norm))
return NULL;
return gst_v4l2_tuner_get_norm_by_std_id (v4l2object, norm); return gst_v4l2_tuner_get_norm_by_std_id (v4l2object, norm);
} }