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fuzzing: fix off-by-one in limit count

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Andrew Kelley 2025-09-25 17:16:10 -07:00
parent 98253bc0ee
commit 2da8ec9865
1 changed files with 42 additions and 42 deletions
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10
lib/fuzzer.zig
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@ -512,7 +512,7 @@ const Fuzzer = struct {
self.corpus_pos = 0; self.corpus_pos = 0;
const rng = self.rng.random(); const rng = self.rng.random();
while (true) { const m = while (true) {
const m = self.mutations.items[rng.uintLessThanBiased(usize, self.mutations.items.len)]; const m = self.mutations.items[rng.uintLessThanBiased(usize, self.mutations.items.len)];
if (!m.mutate( if (!m.mutate(
rng, rng,
@ -524,8 +524,11 @@ const Fuzzer = struct {
inst.const_vals8.items, inst.const_vals8.items,
inst.const_vals16.items, inst.const_vals16.items,
)) continue; )) continue;
break m;
};
self.run(); self.run();
if (inst.isFresh()) { if (inst.isFresh()) {
@branchHint(.unlikely); @branchHint(.unlikely);
@ -569,9 +572,6 @@ const Fuzzer = struct {
); );
self.corpus_dir_idx += 1; self.corpus_dir_idx += 1;
} }
break;
}
} }
}; };
@ -618,7 +618,7 @@ export fn fuzzer_new_input(bytes: abi.Slice) void {
export fn fuzzer_main(limit_kind: abi.LimitKind, amount: u64) void { export fn fuzzer_main(limit_kind: abi.LimitKind, amount: u64) void {
switch (limit_kind) { switch (limit_kind) {
.forever => while (true) fuzzer.cycle(), .forever => while (true) fuzzer.cycle(),
.iterations => for (0..amount -| 1) |_| fuzzer.cycle(), .iterations => for (0..amount) |_| fuzzer.cycle(),
} }
} }