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[CLANG18] MSAN: use-of-uninitialized-value in lib_rend/lib_rend_fx.c:11275:43

Basic Info

Bug description

Clang 18 MSAN found an use-of-uninitialized-value error at lib_rend/lib_rend_fx.c:11275:43:

==18724==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x5567ccde66df in intermidiate_ext_dirac_render /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:11275:43
#1 0x5567ccdd9db2 in renderInputMasa /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9164:21
#2 0x5567ccdab179 in renderActiveInputsMasa /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9238:9
#3 0x5567ccd81062 in getSamplesInternal /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9594:5
#4 0x5567ccd7eda5 in IVAS_REND_GetSamples /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:9615:5
#5 0x5567ccd2574b in main /builds/rep/sa4/audio/ivas-basop/apps/renderer.c:1940:28
#6 0x7fa03dda41c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#7 0x7fa03dda428a in __libc_start_main csu/../csu/libc-start.c:360:3
#8 0x5567ccc7a3e4 in _start (/builds/rep/sa4/audio/ivas-basop/IVAS_rend+0x3a3e4) (BuildId: 95a4b3e2a14753d995ecbd30d0f4bf3185fc019d)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /builds/rep/sa4/audio/ivas-basop/lib_rend/lib_rend_fx.c:11275:43 in intermidiate_ext_dirac_render

How to reproduce

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

Build with

make clean
make -j CLANG=1

Then run

E subprocess.CalledProcessError: Command '['/builds/rep/sa4/audio/ivas-basop/IVAS_rend', '-i', '/builds/rep/sa4/audio/ivas-basop/scripts/testv/spectral_test_1ch_48kHz.wav', '-if', 'MASA1', '-o', '/builds/rep/sa4/audio/ivas-basop/tests/renderer_short/cut/MASA1_to_5_1None_5msNone_48kHz.wav', '-of', '5_1', '-fs', '48', '-no_delay_cmp', '-q', '-im', '/builds/rep/sa4/audio/ivas-basop/scripts/testv/stv1MASA1TC48c.met', '-fr', '5']' returned non-zero exit status 1.

or

python3 -m pytest "test_masa[48kHz-5ms-MASA1-5_1]" -n auto --update_ref --ref_encoder_path ./IVAS_cod --ref_decoder_path ./IVAS_dec