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basetransform: Check if meta transform_func is NULL before using it

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An untested pointer segfaulted in webkit while playing video
on imx6 sabrelite. It turned out that the imx plugin didn't
implement the meta transform function.

The following GST_DEBUG trace was visible:
gstbasetransform.c:1779:foreach_metadata:<conv2> copy metadata
                                                GstImxVpuBufferMetaAPI

Thread 26 vqueue:src received signal SIGSEGV, Segmentation fault.

(gdb) bt
 0x00000000 in ?? ()
 0x73f8d7d8 in foreach_metadata (inbuf=0xc9b020, meta=0x474b2490,
                  user_data=<optimized out>) at gstbasetransform.c:1781
 0x73eb3ea8 in gst_buffer_foreach_meta (buffer=buffer@entry=0xc9b020,
                  func=0x73f8d705 <foreach_metadata>,
                  user_data=user_data@entry=0x474b24d4)
                  at gstbuffer.c:2234

https://bugzilla.gnome.org/show_bug.cgi?id=782050
This commit is contained in:
Frédéric Dalleau 2017-05-02 10:32:54 +02:00 committed by Sebastian Dröge
parent d108ed2251
commit ca7fa6a661
1 changed files with 8 additions and 3 deletions
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11
libs/gst/base/gstbasetransform.c
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@ -1712,10 +1712,15 @@ foreach_metadata (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data)
* function and when it returns %TRUE */
if (do_copy) {
GstMetaTransformCopy copy_data = { FALSE, 0, -1 };
GST_DEBUG_OBJECT (trans, "copy metadata %s", g_type_name (info->api));
/* simply copy then */
info->transform_func (outbuf, *meta, inbuf,
_gst_meta_transform_copy, &copy_data);
if (info->transform_func) {
GST_DEBUG_OBJECT (trans, "copy metadata %s", g_type_name (info->api));
info->transform_func (outbuf, *meta, inbuf,
_gst_meta_transform_copy, &copy_data);
} else {
GST_DEBUG_OBJECT (trans, "couldn't copy metadata %s",
g_type_name (info->api));
}
}
return TRUE;
}