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Fix bounds checking in verify_bitfield - (Spec PR #573) #405

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Feb 27, 2019
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Original file line number Diff line number Diff line change
Expand Up @@ -889,7 +889,7 @@ public static int get_bitfield_bit(Bytes bitfield, int bitPosition) {
public static boolean verify_bitfield(Bytes bitfield, int committee_size) {
if (bitfield.size() != (committee_size + 7) / 8) return false;

for (int i = committee_size + 1; i < committee_size - committee_size % 8 + 8; i++) {
for (int i = committee_size; i < bitfield.bitLength() * 8; i++) {
if (get_bitfield_bit(bitfield, i) == 0b1) return false;
}
return true;
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