### Basic info - Commit SHA: 1df9e4c37f385a2478e6034a078f5ef242b94f4e ### Bug description Clang USAN sanitizer test in pipeline found an error: <!--- Copy sanitizer traceback from command line here --> ``` lib_dec/dec_tcx.c:753:16: runtime error: applying non-zero offset 4 to null pointer SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-nonzero-offset lib_dec/dec_tcx.c:753:16 in lib_dec/dec_LPD.c:608:25: runtime error: applying zero offset to null pointer SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-offset lib_dec/dec_LPD.c:608:25 in ``` For the first one, this is the line of code that is reported: ``` c prm_ltp = &prm[1 + NOISE_FILL_RANGES]; ``` The error is detected in frame 13 which is a lost frame (`st->bfi = 1`). `prm` seems to be `NULL` in this case. In practice, this should not be a problem as no parameters are read from a bitstream for `st->bfi == 1`. So this could probably be safely ignored. A fix would add `if`s around the assignment and all subsequent assignments from `prm` or `prm_ltp` or other variables that get assigned from them - those are quite a lot, so would clutter the code a bit. For the second one: ``` c prm = param + ( k * DEC_NPRM_DIV ); ``` Same thing happening, this time in frame 1106. Frame is lost, `param` is `NULL`. Same options for handling. <!--- Copy test job URL here --> Link to test pipeline: https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/jobs/234373 ### Ways to reproduce Using the [scripts](https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/wikis/Software-development/pyivastest-howto#how-to-reproduce-tests): <!--- check correct sanitizer type --> <!--- add error pattern if needed --> ``` python3 scripts/IvasBuildAndRunChecks.py --checks CLANG3 -m mono_b128_swb_cbr -p /path/to/my/local/ci_linux_ltv_local.json --usan_supp_file scripts/ubsan.supp ``` or directly: [dly_profile.dat](/uploads/561ce5d9ddfef6f93a6eab9b06912637/dly_profile_17_.dat) ``` make clean make -j CLANG=3 ./IVAS_cod 128000 32 ltv32_STEREO.wav bit networkSimulator_g192 dly_profile.dat bit bit_err trace_dump 1 ./IVAS_dec -voip 32 bit_err out.wav ``` <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary. -->