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[CLANG18] MSAN: use-of-uninitialized-value in lib_com/tools_fx.c:1354:16

Basic Info

Bug description

Clang 18 MSAN found an use-of-uninitialized-value error at lib_com/tools_fx.c:1354:16:

==20200==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x558c24a7cf80 in Copy_Scale_sig_16_32_DEPREC /builds/rep/sa4/audio/ivas-basop/lib_com/tools_fx.c:1354:16
#1 0x558c238a3efc in stereo_mdct_core_dec_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_stereo_mdct_core_dec_fx.c:376:9
#2 0x558c2402861d in ivas_core_dec_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_core_dec_fx.c:742:17
#3 0x558c24055f84 in ivas_cpe_dec_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_cpe_dec_fx.c:585:9
#4 0x558c235520f8 in ivas_dec_fx /builds/rep/sa4/audio/ivas-basop/lib_dec/ivas_jbm_dec_fx.c:153:9
#5 0x558c2315cb37 in IVAS_DEC_GetSamplesDecoder /builds/rep/sa4/audio/ivas-basop/lib_dec/lib_dec_fx.c:3909:13
#6 0x558c23101b4d in decodeG192 /builds/rep/sa4/audio/ivas-basop/apps/decoder.c:2294:32
#7 0x558c230e5c82 in main /builds/rep/sa4/audio/ivas-basop/apps/decoder.c:686:17
#8 0x7f32aab2a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#9 0x7f32aab2a28a in __libc_start_main csu/../csu/libc-start.c:360:3
#10 0x558c23047484 in _start (/builds/rep/sa4/audio/ivas-basop/IVAS_dec+0x3b484) (BuildId: d67431847b0666f23b12d4f8ec995e42039e27da)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /builds/rep/sa4/audio/ivas-basop/lib_com/tools_fx.c:1354:16 in Copy_Scale_sig_16_32_DEPREC

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 -stereo -dtx 48000 16 scripts/testv/stvST16n.wav stvST16n.wav_stereo_at_48_kbps_16_kHz_in_16_kHz_out_DTX_on.192
IVAS_dec -fr 20 STEREO 16 stvST16n.wav_stereo_at_48_kbps_16_kHz_in_16_kHz_out_DTX_on.192 stvST16n.wav_stereo_at_48_kbps_16_kHz_in_16_kHz_out_DTX_on.dec.wav

or

python3 -m pytest "test_param_file_tests[stv-stereo at 48 kbps, 16 kHz in, 16 kHz out, DTX on]" -n auto --update_ref --ref_encoder_path ./IVAS_cod --ref_decoder_path ./IVAS_dec