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8282144: RandomSupport.convertSeedBytesToLongs sign extension overwrites previous bytes

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Reviewed-by: bpb
This commit is contained in:
Jim Laskey 2022-03-08 13:25:34 +00:00
parent 65ca0a5776
commit 5fab27e1b8
2 changed files with 72 additions and 1 deletions
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2
src/java.base/share/classes/jdk/internal/util/random/RandomSupport.java
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@ -265,7 +265,7 @@ public class RandomSupport {
final int m = Math.min(seed.length, n << 3);
// Distribute seed bytes into the words to be formed.
for (int j = 0; j < m; j++) {
result[j>>3] = (result[j>>3] << 8) | seed[j];
result[j>>3] = (result[j>>3] << 8) | (seed[j] & 0xFF);
}
// If there aren't enough seed bytes for all the words we need,
// use a SplitMix-style PRNG to fill in the rest.