On Sat, May 10, 2025 at 12:51:09PM -0300, James Almer wrote: > We may write up to 43 bits, so 5 bytes is not enough. > > Fixes: Assertion n>=0 && n<=32 failed at ./libavcodec/get_bits.h:406 > Fixes: > 398527871/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-6602025714647040 > > Found-by: continuous fuzzing process > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > Signed-off-by: James Almer <jamr...@gmail.com> > --- > libavformat/iamf_parse.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/libavformat/iamf_parse.c b/libavformat/iamf_parse.c > index abedfdb066..14b69855c9 100644 > --- a/libavformat/iamf_parse.c > +++ b/libavformat/iamf_parse.c > @@ -285,7 +285,7 @@ static int update_extradata(AVCodecParameters *codecpar) > AV_WL16A(codecpar->extradata + 16, AV_RB16A(codecpar->extradata + > 16)); // Byte swap Output Gain > break; > case AV_CODEC_ID_AAC: { > - uint8_t buf[5]; > + uint8_t buf[6];
fails fate (with assertions enabled) libavutil 60. 2.100 / 60. 2.100 libavcodec 62. 3.101 / 62. 3.101 libavformat 62. 0.102 / 62. 0.102 libavdevice 62. 0.100 / 62. 0.100 libavfilter 11. 0.100 / 11. 0.100 libswscale 9. 0.100 / 9. 0.100 libswresample 6. 0.100 / 6. 0.100 Assertion n>=0 && n<=32 failed at ./libavcodec/get_bits.h:406 Aborted (core dumped) threads=1 make: *** [tests/Makefile:316: fate-iamf-stereo-demux] Error 134 [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB He who knows, does not speak. He who speaks, does not know. -- Lao Tsu
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