Merged revision(s) 20960 from trunk/OpenMPT:

[Fix] MO3: Don't try to load comrpessed samples if the header says that it's a 0-length sample anyway. This may cause a sample buffer to be allocated and its size be reduced to 0, which is an API violation (see assertion in ModSample::HasSampleData()). Found with afl++.
........


git-svn-id: https://source.openmpt.org/svn/openmpt/branches/OpenMPT-1.30@20962 56274372-70c3-4bfc-bfc3-4c3a0b034d27

soundlib/Load_mo3.cpp

@@ -1360,6 +1360,8 @@ bool CSoundFile::ReadMO3(FileReader &file, ModLoadingFlags loadFlags)
 				sample.uFlags.set(CHN_STEREO);
 
 			FileReader sampleData = file.ReadChunk(smpHeader.compressedSize);
+			if(!smpHeader.length)
+				continue;
 			const uint8 numChannels = sample.GetNumChannels();
 
 			if(compression == MO3Sample::smpDeltaCompression || compression == MO3Sample::smpDeltaPrediction)