https://github.com/python/cpython/commit/31c41a61f1afb7929d2698e48894264d8e2df86b
commit: 31c41a61f1afb7929d2698e48894264d8e2df86b
branch: main
author: Stan Ulbrych <[email protected]>
committer: ammaraskar <[email protected]>
date: 2026-03-14T11:11:29-07:00
summary:
Fix `fuzz_builtin_int` fuzzer reproducibility (#145890)
files:
M Modules/_xxtestfuzz/fuzzer.c
diff --git a/Modules/_xxtestfuzz/fuzzer.c b/Modules/_xxtestfuzz/fuzzer.c
index 6cb11562476e40..02afb01d3731fb 100644
--- a/Modules/_xxtestfuzz/fuzzer.c
+++ b/Modules/_xxtestfuzz/fuzzer.c
@@ -38,23 +38,18 @@ static int fuzz_builtin_float(const char* data, size_t
size) {
static int fuzz_builtin_int(const char* data, size_t size) {
/* Ignore test cases with very long ints to avoid timeouts
int("9" * 1000000) is not a very interesting test caase */
- if (size > MAX_INT_TEST_SIZE) {
+ if (size < 1 || size > MAX_INT_TEST_SIZE) {
return 0;
}
- /* Pick a random valid base. (When the fuzzed function takes extra
- parameters, it's somewhat normal to hash the input to generate those
- parameters. We want to exercise all code paths, so we do so here.) */
- int base = Py_HashBuffer(data, size) % 37;
+ // Use the first byte to pick a base
+ int base = ((unsigned char) data[0]) % 37;
if (base == 1) {
// 1 is the only number between 0 and 36 that is not a valid base.
base = 0;
}
- if (base == -1) {
- return 0; // An error occurred, bail early.
- }
- if (base < 0) {
- base = -base;
- }
+
+ data += 1;
+ size -= 1;
PyObject* s = PyUnicode_FromStringAndSize(data, size);
if (s == NULL) {
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