On Thu, May 28, 2020 at 02:06:32PM +0000, Zane van Iperen wrote: > On Thu, 28 May 2020 14:12:33 +0200 > "Michael Niedermayer" <mich...@niedermayer.cc> wrote: > > > > > Fixes: overread by 1 > > Fixes: > > 21880/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_IMA_CUNNING_fuzzer-5717917221257216.fuzz > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > > > -const int8_t ff_adpcm_ima_cunning_index_table[8] = { > > - -1, -1, -1, -1, 1, 2, 3, 4, > > +const int8_t ff_adpcm_ima_cunning_index_table[9] = { > > + -1, -1, -1, -1, 1, 2, 3, 4, 5 > > }; > > > The index table should only ever be indexed between [0,7], so this > looks like a bug in adpcm_ima_cunning_expand_nibble() instead.
maybe it should be only 0..7 but abs(-8 .. 7) needs a 8th entrty or a check > > Where would one go to see the inputs for this? I'd like to investigate > (and test against the original decoder). The file is from a fuzzer so is random trash and it needs target_dec_fuzzer.c to be read. It wont be read as "Pro Pinball Series Soundbank" so i think that file will not be useful to test the behavior of the original decoder as i would assume it will not accept the target_dec_fuzzer data but i surely can send it to you privatly if you need it. just say if you want me to send you the file Thanks [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB He who knows, does not speak. He who speaks, does not know. -- Lao Tsu
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