MSAN: use-of-uninitialized-value in lib_dec/er_dec_tcx_fx.c:189:15

Basic info

Bug description

Msan bug in EVS decoding:

Frames processed:       895     ==2930==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x558c50e4929e in con_tcx_fx /ivas-basop/lib_dec/er_dec_tcx_fx.c:189:15
    #1 0x558c5103cd64 in decoder_LPD_fx /ivas-basop/lib_dec/dec_LPD_fx.c:573:13
    #2 0x558c50d8146e in dec_acelp_tcx_frame_fx /ivas-basop/lib_dec/dec_acelp_tcx_main_fx.c:462:13
    #3 0x558c5025d0b7 in evs_dec_fx /ivas-basop/lib_dec/evs_dec_fx.c:756:9
    #4 0x558c4ffe7880 in evs_dec_main_fx /ivas-basop/lib_dec/lib_dec_fx.c:5632:13
    #5 0x558c4ffe2b88 in IVAS_DEC_GetSamplesDecoder /ivas-basop/lib_dec/lib_dec_fx.c:3891:13
    #6 0x558c4ff86db0 in decodeG192 /ivas-basop/apps/decoder.c:2299:32
    #7 0x558c4ff6b887 in main /ivas-basop/apps/decoder.c:671:17
    #8 0x7f78bc8501c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #9 0x7f78bc85028a in __libc_start_main csu/../csu/libc-start.c:360:3
    #10 0x558c4fecd484 in _start (/ivas-basop/IVAS_dec+0x3b484) (BuildId: 2d0adc4d5822d3a5ea2af3ae89e1d910f1a59982)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /ivas-basop/lib_dec/er_dec_tcx_fx.c:189:15 in con_tcx_fx

This is a blocker for the complexity measurements and the root cause for #2466 (closed) .

Ways to reproduce

ltv48_STEREO_StereoDmxEvs_b09_6_dtx_swb_cbr_fer_ep_10pct_fer_g192.192

make clean
make -j CLANG=1
IVAS_dec 32 ltv48_STEREO_StereoDmxEvs_b09_6_dtx_swb_cbr_fer_ep_10pct_fer_g192.192 out.wav