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[CLANG18] MSAN: use-of-uninitialized-value in lib_enc/igf_enc_fx.c:4298:9

Basic Info

Bug description

Clang 18 MSAN found an use-of-uninitialized-value error at lib_enc/igf_enc_fx.c:4298:9:

==19975==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x5631d6050b4d in IGFEncApplyStereo_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/igf_enc_fx.c:4298:9
#1 0x5631d5d5aa45 in ProcessStereoIGF_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/tcx_utils_enc_fx.c:4010:5
#2 0x5631d62c64cd in stereo_mdct_core_enc_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_stereo_mdct_core_enc_fx.c:626:21
#3 0x5631d609a2f9 in ivas_core_enc_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_core_enc_fx.c:574:17
#4 0x5631d6117d4b in ivas_cpe_enc_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_cpe_enc_fx.c:1275:5
#5 0x5631d573e423 in ivas_enc_fx /builds/rep/sa4/audio/ivas-basop/lib_enc/ivas_enc_fx.c:180:9
#6 0x5631d563a675 in IVAS_ENC_EncodeFrameToSerial /builds/rep/sa4/audio/ivas-basop/lib_enc/lib_enc_fx.c:1502:13
#7 0x5631d561994a in main /builds/rep/sa4/audio/ivas-basop/apps/encoder.c:877:28
#8 0x7fd539f1a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#9 0x7fd539f1a28a in __libc_start_main csu/../csu/libc-start.c:360:3
#10 0x5631d5579454 in _start (/builds/rep/sa4/audio/ivas-basop/IVAS_cod+0x38454) (BuildId: 1e98dc6728760144942259e69e2f21b3f1a998a8)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /builds/rep/sa4/audio/ivas-basop/lib_enc/igf_enc_fx.c:4298:9 in IGFEncApplyStereo_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 -max_band scripts/testv/ivas_bws_20fr_start_SWB.txt -stereo -dtx 48000 48 scripts/testv/stvST48n.wav stvST48n.wav_stereo_at_48_kbps_48_kHz_in_48_kHz_out_DTX_on_bandwidth_switching.192

or

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