Update random.c

Supersedes #1589

diff --git a/ext/standard/random.c b/ext/standard/random.c
index 5fbb46018442ad088eb304bafd8b75e9cd976683..7dbc379459f97a5ad35357e54b1d0e65fd3144fb 100644 (file)
--- a/ext/standard/random.c
+++ b/ext/standard/random.c
@@ -102,7 +102,6 @@ PHPAPI int php_random_bytes(void *bytes, size_t size, zend_bool should_throw)
 
        /* Keep reading until we get enough entropy */
        do {
-               amount_to_read = size - read_bytes;
                /* Below, (bytes + read_bytes)  is pointer arithmetic.
 
                   bytes   read_bytes  size
@@ -112,6 +111,7 @@ PHPAPI int php_random_bytes(void *bytes, size_t size, zend_bool should_throw)
                              amount_to_read
 
                */
+               amount_to_read = size - read_bytes;
                n = syscall(SYS_getrandom, bytes + read_bytes, amount_to_read, 0);
 
                if (n == -1) {