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avcodec/vlc: Clear val8/16 in vlc_multi_gen() by av_mallocz()

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Fixes: use of uninitialized memory
Fixes: 427814450/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MAGICYUV_DEC_fuzzer-646512196065689
Fixes: 445961558/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_DEC_fuzzer-5515158672965632

the multi vlc code will otherwise return uninitialized data. Now one can argue that this data should
not be used, but on errors this data can remain ...

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-08-06 12:49:49 +02:00
parent d03483bd26
commit d8ffec5bf9
1 changed files with 1 additions and 1 deletions
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2
libavcodec/vlc.c
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@@ -527,7 +527,7 @@ int ff_vlc_init_multi_from_lengths(VLC *vlc, VLC_MULTI *multi, int nb_bits, int
if (ret < 0)
return ret;
multi->table = av_malloc(sizeof(*multi->table) << nb_bits);
multi->table = av_mallocz(sizeof(*multi->table) << nb_bits);
if (!multi->table)
goto fail;