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Merge pull request #3634 from 94xhn/fix/json-hex-validation

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Reject malformed input in mg_json_get_hex
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Sergio R. Caprile authored and GitHub committed 2026-07-24 11:36:31 -03:00
2 parents af7eaaa9b1 dc52d8b1dc
commit f8e785f56b
5 files changed
+29 -13
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test/unit_test.c
+11 -1
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@@ -3746,13 +3746,23 @@ static void test_json(void) {
ASSERT(b == true);
ASSERT(mg_json_get(json, "$.b[2]", &len) < 0);
json = mg_str("[\"YWJj\", \"0100026869\"]");
json = mg_str("[\"YWJj\", \"0100026869\", \"\", \"abc\", \"0g\"]");
ASSERT((str = mg_json_get_b64(json, "$[0]", &len)) != NULL);
ASSERT(len == 3 && memcmp(str, "abc", (size_t) len) == 0);
mg_free(str);
ASSERT((str = mg_json_get_hex(json, "$[1]", &len)) != NULL);
ASSERT(len == 5 && memcmp(str, "\x01\x00\x02hi", (size_t) len) == 0);
mg_free(str);
ASSERT((str = mg_json_get_hex(json, "$[2]", &len)) != NULL);
ASSERT(len == 0 && str[0] == '\0');
mg_free(str);
len = 42;
str = mg_json_get_hex(json, "$[3]", &len);
ASSERT(str == NULL && len == 42);
mg_free(str);
str = mg_json_get_hex(json, "$[4]", &len);
ASSERT(str == NULL && len == 42);
mg_free(str);
json = mg_str("{\"a\":[1,2,3], \"ab\": 2}");
ASSERT(mg_json_get_long(json, "$.a[0]", -42) == 1);