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chore: Fix a fuzz failure by using checked_sub

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Chris Hennick 2024-06-02 21:16:55 -07:00
parent fb781e0517
commit 9218599b40
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GPG key ID: DA47AABA4961C509
1 changed files with 4 additions and 2 deletions
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6
src/extra_fields/zipinfo_utf8.rs
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@ -32,8 +32,10 @@ impl UnicodeExtraField {
reader.read_exact(&mut [0u8])?;
let crc32 = reader.read_u32_le()?;
let mut content =
vec![0u8; len as usize - size_of::<u8>() - size_of::<u32>()].into_boxed_slice();
let content_len = (len as usize)
.checked_sub(size_of::<u8>() + size_of::<u32>())
.ok_or(ZipError::InvalidArchive("Unicode extra field is too small"))?;
let mut content = vec![0u8; content_len].into_boxed_slice();
reader.read_exact(&mut content)?;
Ok(Self { crc32, content })
}