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Fix Bitfield from_bytes empty vec bug (#487)

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Credit to @kirk-baird for finding the bug with the fuzzer.

Co-authored-by: Kirk Baird <baird.k@outlook.com>
This commit is contained in:
Michael Sproul 2019-08-05 18:06:24 +10:00 committed by Paul Hauner
parent e21d3fed05
commit 65c18ddc60
1 changed files with 6 additions and 2 deletions
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8
eth2/utils/ssz_types/src/bitfield.rs
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@ -163,8 +163,7 @@ impl<N: Unsigned + Clone> Bitfield<Variable<N>> {
pub fn from_bytes(bytes: Vec<u8>) -> Result<Self, Error> {
let mut initial_bitfield: Bitfield<Variable<N>> = {
let num_bits = bytes.len() * 8;
Bitfield::from_raw_bytes(bytes, num_bits)
.expect("Must have adequate bytes for bit count.")
Bitfield::from_raw_bytes(bytes, num_bits)?
};
let len = initial_bitfield
@ -802,6 +801,11 @@ mod bitlist {
#[test]
fn ssz_decode() {
assert!(BitList0::from_ssz_bytes(&[]).is_err());
assert!(BitList1::from_ssz_bytes(&[]).is_err());
assert!(BitList8::from_ssz_bytes(&[]).is_err());
assert!(BitList16::from_ssz_bytes(&[]).is_err());
assert!(BitList0::from_ssz_bytes(&[0b0000_0000]).is_err());
assert!(BitList1::from_ssz_bytes(&[0b0000_0000, 0b0000_0000]).is_err());
assert!(BitList8::from_ssz_bytes(&[0b0000_0000]).is_err());