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fix: handle null values in Arrays.equal/compare hooks #1017

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Merged
merged 1 commit into from
Nov 24, 2025
Merged

fix: handle null values in Arrays.equal/compare hooks #1017

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2 changes: 2 additions & 0 deletions src/main/java/com/code_intelligence/jazzer/runtime/TraceCmpHooks.java
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Original file line number Diff line number Diff line change
Expand Up @@ -744,6 +744,7 @@ public static void arraysEquals(
if (returnValue) return;
byte[] first = (byte[]) arguments[0];
byte[] second = (byte[]) arguments[1];
if (first == null || second == null) return;
TraceDataFlowNativeCallbacks.traceMemcmp(first, second, 1, hookId);
}

Expand Down Expand Up @@ -777,6 +778,7 @@ public static void arraysCompare(
if (returnValue == 0) return;
byte[] first = (byte[]) arguments[0];
byte[] second = (byte[]) arguments[1];
if (first == null || second == null) return;
TraceDataFlowNativeCallbacks.traceMemcmp(first, second, returnValue, hookId);
}

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9 changes: 9 additions & 0 deletions src/test/java/com/code_intelligence/jazzer/runtime/TraceCmpHooksTest.java
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Expand Up @@ -52,4 +52,13 @@ public void cmpHookShouldHandleConcurrentModifications() throws InterruptedExcep
// noinspection ResultOfMethodCallIgnored
ES.awaitTermination(5, TimeUnit.SECONDS);
}

@Test
public void handlesNullValuesInArrayCompare() {
byte[] b1 = new byte[10];
byte[] b2 = null;
// Make sure we don't crash the JVM on null arrays.
TraceCmpHooks.arraysEquals(null, null, new Object[] {b1, b2}, 1, false);
TraceCmpHooks.arraysCompare(null, null, new Object[] {b1, b2}, 1, 1);
}
}