Panic with wav files

[qarmin]

thread 'main' panicked at 'index out of bounds: the len is 89 but the index is 184', /home/rafal/.cargo/git/checkouts/symphonia-8fbe6c90fc095688/b4ef823/symphonia-codec-adpcm/src/codec_ima.rs:51:20
stack backtrace:
   0: rust_begin_unwind
             at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/panicking.rs:64:14
   2: core::panicking::panic_bounds_check
             at /rustc/2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74/library/core/src/panicking.rs:159:5
   3: symphonia_codec_adpcm::codec_ima::decode_mono
   4: <symphonia_codec_adpcm::AdpcmDecoder as symphonia_core::codecs::Decoder>::decode
   5: symphonia::main

Broken.zip

[dedobbin]

Hey! I'm kinda looking into this.
It should definitely not crash, but when i play these files in audacity it also doesn't sound quite uh.. healthy.
Is there any context to these files? Is that the sound it's supposed to make ?

[qarmin]

In my app I have option to find broken files, so users can find really strange files that crashes this library in many ways, so I try to find the files myself.

This files were found by fuzzer, so music inside probably is broken.

[dedobbin]

From what i've seen while playing around, it plays some samples correct, but eventually reads an invalid value, which should be the key for the step table in symphonia-codec-adpcm/src/codec_ima.rs

I traced the code, to see if anything is off spec for ADPCM decoding. I found some leads but nothing definite.

[dedobbin]

After discussing my findings with @pdeljanov a solution was found. Other applications seem to drop the data when such an impossible entry is found.

I can pick this up and implement this for this specific format as well.