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fix: don't panic on non minimal varints #293

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merged 1 commit into from
Apr 14, 2023

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@vmx vmx commented Apr 13, 2023

If a varint it non-minimally encoded in a no_std environment, don't panic, but return an error.

Also some minor Clippy warnings were fixed.

Fixes #282.

If a varint it non-minimally encoded in a no_std environment,
don't panic, but return an error.

Also some minor Clippy warnings were fixed.

Fixes #282.
@vmx vmx requested a review from mxinden April 13, 2023 09:09
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@mattheworris mattheworris left a comment

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Thanks for the quick response.

#[test]
fn decode_non_minimal_error() {
// This is a non-minimal varint.
let data = [241, 0, 0, 0, 0, 0, 128, 132, 132, 132, 58];

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Just another data point, here's the data that we found from fuzz testing that caused the panic:
let data = [0, 1, 0, 1, 203, 155, 0, 0, 0, 5, 67];

Comment on lines +366 to +368
return decode::u64(&b[..=i])
.map(|decoded| decoded.0)
.map_err(Error::Varint);

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I tested this change with our project and it fixes the panic, Thanks!

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With my limited knowledge of rust-multihash, this looks good to me.

@vmx vmx merged commit c3445fc into release/v0.18.x Apr 14, 2023
@vmx vmx deleted the decode-overflow-backport branch April 14, 2023 16:36
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4 participants