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Fix for https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38913

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This commit is contained in:
Sean Owen 2021-09-17 21:46:37 -05:00
parent c6a4e0fa97
commit be2c5bdd88
1 changed files with 3 additions and 2 deletions
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5
core/src/main/java/com/google/zxing/common/reedsolomon/ReedSolomonDecoder.java
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@ -100,7 +100,7 @@ public final class ReedSolomonDecoder {
GenericGFPoly t = field.getOne(); GenericGFPoly t = field.getOne();
// Run Euclidean algorithm until r's degree is less than R/2 // Run Euclidean algorithm until r's degree is less than R/2
while (r.getDegree() >= R / 2) { while (2 * r.getDegree() >= R) {
GenericGFPoly rLastLast = rLast; GenericGFPoly rLastLast = rLast;
GenericGFPoly tLastLast = tLast; GenericGFPoly tLastLast = tLast;
rLast = r; rLast = r;
@ -125,7 +125,8 @@ public final class ReedSolomonDecoder {
t = q.multiply(tLast).addOrSubtract(tLastLast); t = q.multiply(tLast).addOrSubtract(tLastLast);
if (r.getDegree() >= rLast.getDegree()) { if (r.getDegree() >= rLast.getDegree()) {
throw new IllegalStateException("Division algorithm failed to reduce polynomial?"); throw new IllegalStateException("Division algorithm failed to reduce polynomial? " +
"r: " + r + ", rLast: " + rLast);
} }
} }