From 682cf7e9b05833cb7502f29edbcf4e0fa567cdf4 Mon Sep 17 00:00:00 2001
From: Ben Fuhrmannek
Date: Mon, 13 Dec 2021 13:57:18 +0100
Subject: fixed use after free + PHP 7 compatibility

---
 src/sp_unserialize.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/sp_unserialize.c b/src/sp_unserialize.c
index 4a9f565..c2173d3 100644
--- a/src/sp_unserialize.c
+++ b/src/sp_unserialize.c
@@ -1,14 +1,25 @@
 #include "php_snuffleupagus.h"
 
 // condensed version of PHP's php_hash_do_hash_hmac() in ext/hash/hash.c
+#if PHP_VERSION_ID < 80000
+static inline void *php_hash_alloc_context(const php_hash_ops *ops) {
+  /* Zero out context memory so serialization doesn't expose internals */
+  return ecalloc(1, ops->context_size);
+}
+#endif
+
 static zend_string *sp_do_hash_hmac_sha256(char *data, size_t data_len, char *key, size_t key_len)
 {
+#if PHP_VERSION_ID < 80000
+  const php_hash_ops *ops = php_hash_fetch_ops(ZEND_STRL("sha256"));
+#else
   zend_string *algo = zend_string_init(ZEND_STRL("sha256"), 0);
   const php_hash_ops *ops = php_hash_fetch_ops(algo);
   zend_string_release_ex(algo, 0);
+#endif
 
   if (!ops || !ops->is_crypto) {
-    sp_log_err("unsupported hash algorithm for hmac: %s", ZSTR_VAL(algo));
+    sp_log_err("hmac", "unsupported hash algorithm: sha256");
     return NULL;
   }
 
@@ -35,6 +46,8 @@ static zend_string *sp_do_hash_hmac_sha256(char *data, size_t data_len, char *ke
   return hex_digest;
 }
 
+// ------------------
+
 PHP_FUNCTION(sp_serialize) {
   zif_handler orig_handler;
 
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