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Don't subtract overflow when 64-bit box size is less than 8 (#89)

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* don't subtract overflow when 64-bit box size is less than 8

* fix largesize of 8 being conflated with a size of 0
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Jessa 2023-01-09 23:12:14 -08:00 committed by GitHub
parent df6e0b5ea0
commit 16c1b5d67f
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1 changed files with 33 additions and 1 deletions
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34
src/mp4box/mod.rs
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@ -245,7 +245,15 @@ impl BoxHeader {
Ok(BoxHeader {
name: BoxType::from(typ),
size: largesize - HEADER_SIZE,
// Subtract the length of the serialized largesize, as callers assume `size - HEADER_SIZE` is the length
// of the box data. Disallow `largesize < 16`, or else a largesize of 8 will result in a BoxHeader::size
// of 0, incorrectly indicating that the box data extends to the end of the stream.
size: match largesize {
0 => 0,
1..=15 => return Err(Error::InvalidData("64-bit box size too small")),
16..=u64::MAX => largesize - 8,
},
})
} else {
Ok(BoxHeader {
@ -356,4 +364,28 @@ mod tests {
let ftyp_fcc2: u32 = ftyp_value.into();
assert_eq!(ftyp_fcc, ftyp_fcc2);
}
#[test]
fn test_largesize_too_small() {
let error = BoxHeader::read(&mut &[0, 0, 0, 1, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 0, 7][..]);
assert!(matches!(error, Err(Error::InvalidData(_))));
}
#[test]
fn test_zero_largesize() {
let error = BoxHeader::read(&mut &[0, 0, 0, 1, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 0, 8][..]);
assert!(matches!(error, Err(Error::InvalidData(_))));
}
#[test]
fn test_nonzero_largesize_too_small() {
let error = BoxHeader::read(&mut &[0, 0, 0, 1, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 0, 15][..]);
assert!(matches!(error, Err(Error::InvalidData(_))));
}
#[test]
fn test_valid_largesize() {
let header = BoxHeader::read(&mut &[0, 0, 0, 1, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 0, 16][..]);
assert!(matches!(header, Ok(BoxHeader { size: 8, .. })));
}
}