Avoid bad memory access in LOD texture failure case, ref ryzom/ryzomcore_graphics#22

nel/src/3d/lod_character_manager.cpp

@@ -979,6 +979,9 @@ void			CLodCharacterManager::addTextureCompute(CLodCharacterInstance &instance,
 
 	// get lookup ptr.
 	nlassert(lodTexture.Texture.size()==NL3D_CLOD_TEXT_SIZE);
+	if (lodTexture.Texture.size() < NL3D_CLOD_TEXT_SIZE)
+		return;
+
 	const CLodCharacterTexture::CTUVQ		*lookUpPtr= &lodTexture.Texture[0];
 
 	// apply the lodTexture, taking only better quality (ie nearer 0)

nel/tools/3d/build_clodtex/lod_texture_builder.cpp

@@ -135,6 +135,9 @@ bool			CLodTextureBuilder::computeTexture(const CMeshMRM &meshMRM, NL3D::CLodCha
 	const uint8			*srcPos= (const uint8*)vba.getVertexCoordPointer();
 	const uint8			*srcNormal= (const uint8*)vba.getNormalCoordPointer();
 	const uint8			*srcUV= (const uint8*)vba.getTexCoordPointer();
+	nlassert(srcPos);
+	nlassert(srcNormal);
+	nlassert(srcUV);
 	uint				vertexSize = VB.getVertexSize();
 	// For the more precise lod
 	uint	lodId= meshMRM.getNbLod()-1;