A potential bug of NPD related to usage of libogg

[ash1852]

Hi, I found a potential null pointer dereference bug in the project source code of opusfile related to usage of libogg, and I have shown the execution sequence of the program that may generate the bug on the graph below. The red text illustrates the steps that generate the bug, the red arrows represent the control flow.

in short, the key step is not check the return value of call-statement relate to libogg.

opusfile/src/opusfile.c

Lines 2240 to 2246 in a46042a

	static void op_buffer_continued_data(OggOpusFile *_of,ogg_page *_og){
	ogg_packet op;
	ogg_stream_pagein(&_of->os,_og);
	/*Drain any packets that did end on this page (and ignore holes).
	We only care about the continued packet data.*/
	while(ogg_stream_packetout(&_of->os,&op));
	}

would you help to check if this bug is true?thank you for your patience and effort.