Fix crash when converting array data for array in shm in xxh3

Author: ndossche

ext/hash/hash_xxhash.c

@@ -174,19 +174,24 @@ zend_always_inline static void _PHP_XXH3_Init(PHP_XXH3_64_CTX *ctx, HashTable *a
 			func_init_seed(&ctx->s, (XXH64_hash_t)Z_LVAL_P(_seed));
 			return;
 		} else if (_secret) {
-			if (!try_convert_to_string(_secret)) {
+			zval secret_copy;
+			ZVAL_COPY(&secret_copy, _secret);
+			if (!try_convert_to_string(&secret_copy)) {
+				zval_ptr_dtor(&secret_copy);
 				return;
 			}
-			size_t len = Z_STRLEN_P(_secret);
+			size_t len = Z_STRLEN(secret_copy);
 			if (len < PHP_XXH3_SECRET_SIZE_MIN) {
+				zval_ptr_dtor(&secret_copy);
 				zend_throw_error(NULL, "%s: Secret length must be >= %u bytes, %zu bytes passed", algo_name, XXH3_SECRET_SIZE_MIN, len);
 				return;
 			}
 			if (len > sizeof(ctx->secret)) {
 				len = sizeof(ctx->secret);
 				php_error_docref(NULL, E_WARNING, "%s: Secret content exceeding %zu bytes discarded", algo_name, sizeof(ctx->secret));
 			}
-			memcpy((unsigned char *)ctx->secret, Z_STRVAL_P(_secret), len);
+			memcpy((unsigned char *)ctx->secret, Z_STRVAL(secret_copy), len);
+			zval_ptr_dtor(&secret_copy);
 			func_init_secret(&ctx->s, ctx->secret, len);
 			return;
 		}

ext/hash/tests/xxh3_convert_secret_to_string.phpt

@@ -0,0 +1,14 @@
+--TEST--
+xxh3 convert secret to string should not modify (shm) array
+--FILE--
+<?php
+try {
+	hash_init("xxh3", options: $x = ["secret" => 4]);
+} catch (Throwable) {}
+var_dump($x);
+?>
+--EXPECT--
+array(1) {
+  ["secret"]=>
+  int(4)
+}