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[CLANG18] MSAN: use-of-uninitialized-value in lib_dec/ivas_mc_param_dec_fx.c:3409:26

Basic Info

Bug description

Clang 18 MSAN found an use-of-uninitialized-value error at lib_dec/ivas_mc_param_dec_fx.c:3409:26:

==20762==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x5595c2d8c8ad in ivas_param_mc_dequantize_cov_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:3409:26
#1 0x5595c2d73c68 in ivas_param_mc_get_mixing_matrices_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:2837:5
#2 0x5595c2d70e0b in ivas_param_mc_dec_prepare_renderer /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:1842:21
#3 0x5595c2ce4d43 in ivas_dec_prepare_renderer_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_jbm_dec_fx.c:3840:13
#4 0x5595c28b4039 in IVAS_DEC_PrepareRenderer /builds/rep/sa4/audio/ivas-basop/lib_dec/lib_dec_fx.c:4610:9
#5 0x5595c2848378 in decodeG192 /builds/rep/sa4/audio/ivas-basop/apps/decoder.c:2329:32
#6 0x5595c282bc82 in main /builds/rep/sa4/audio/ivas-basop/apps/decoder.c:684:17
#7 0x7f2e06baa1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#8 0x7f2e06baa28a in __libc_start_main csu/../csu/libc-start.c:360:3
#9 0x5595c278d484 in _start (/builds/rep/sa4/audio/ivas-basop/IVAS_dec+0x3b484) (BuildId: dc6ade48efbaef05ff2ecb1f03e3fcc0d0df194c)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_mc_param_dec_fx.c:3409:26 in ivas_param_mc_dequantize_cov_fx

How to reproduce

⚠️ Make sure to use CLANG v18 for building the codec :warning

Build with

make clean
make -j CLANG=1

Then run

IVAS_cod -mc 5_1_2 80000 48 scripts/testv/stv512MC48c.wav stv512MC48c.wav_Multi_channel_5_1_2_at_80_kbps_48kHz_in_48kHz_out_5_1_out.192
IVAS_dec -fr 20 5_1 48 stv512MC48c.wav_Multi_channel_5_1_2_at_80_kbps_48kHz_in_48kHz_out_5_1_out.192 stv512MC48c.wav_Multi_channel_5_1_2_at_80_kbps_48kHz_in_48kHz_out_5_1_out.dec.wav

or

python3 -m pytest "test_param_file_tests[stv-Multi-channel 5_1_2 at 80 kbps, 48kHz in, 48kHz out, 5_1 out]" -n auto --update_ref --ref_encoder_path ./IVAS_cod --ref_decoder_path ./IVAS_dec