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Fix underflow in shuffle with empty list

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This commit is contained in:
Paul Hauner 2018-10-22 05:24:13 +11:00
parent bdb5c45e60
commit db735a598f
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1 changed files with 1 additions and 1 deletions
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2
beacon_chain/utils/shuffling/src/lib.rs
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@ -34,7 +34,7 @@ pub fn shuffle<T>(
return Ok(list); return Ok(list);
} }
for i in 0..(list.len() - 1) { for i in 0..(list.len().saturating_sub(1)) {
let n = list.len() - i; let n = list.len() - i;
let j = rng.rand_range(n as u32) as usize + i; let j = rng.rand_range(n as u32) as usize + i;
list.swap(i, j); list.swap(i, j);