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libfuzzer: check weights for bytes mutations

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This commit is contained in:
Kendall Condon
2026-03-11 20:23:23 -04:00
parent b4ffb402c0
commit c3a417206a
1 changed files with 16 additions and 6 deletions
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lib/fuzzer.zig
+16 -6
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@@ -1320,13 +1320,23 @@ const Fuzzer = struct {
if (opts.copy != 0) {
if (opts.fresh == 0 or slice_i == data_slice.len) return .fresh;
return .{ .mutate = switch (uid.kind) {
.int => .{ .int = data.ints[data_i] },
.bytes => .{ .bytes = b: {
switch (uid.kind) {
.int => {
const int = data.ints[data_i];
if (weightsContain(int, weights)) {
@branchHint(.likely);
return .{ .mutate = .{ .int = int } };
}
},
.bytes => {
const entry = data.bytes.entries[data_i];
break :b data.bytes.table[entry.off..][0..entry.len];
} },
} };
const bytes = data.bytes.table[entry.off..][0..entry.len];
if (weightsContainBytes(bytes, weights)) {
@branchHint(.likely);
return .{ .mutate = .{ .bytes = bytes } };
}
},
}
}
if (!opts.splice) {