MFH: fix #37595 (mcrypt_generic calculates data length in wrong way)

NEWS

@@ -55,6 +55,8 @@ PHP                                                                        NEWS
 - Fixed bug #37616 (DATE_RFC822 does not product RFC 822 dates).
   (Hannes Magnusson, Derick)
 - Fixed bug #37614 (Class name lowercased in error message). (Johannes)
+- Fixed bug #37595 (mcrypt_generic calculates data length in wrong way). 
+  (Tony)
 - Fixed bug #37587 (var without attribute causes segfault). (Marcus)
 - Fixed bug #37586 (Bumped minimum PCRE version to 6.6, needed for recursion
   limit support). (Ilia)

ext/mcrypt/mcrypt.c

@@ -496,7 +496,7 @@ PHP_FUNCTION(mcrypt_generic)
 	/* Check blocksize */
 	if (mcrypt_enc_is_block_mode(pm->td) == 1) { /* It's a block algorithm */
 		block_size = mcrypt_enc_get_block_size(pm->td);
-		data_size = (((Z_STRLEN_PP(data) - 1) / block_size) + 1) * block_size;
+		data_size = ((Z_STRLEN_PP(data) / block_size) + 1) * block_size;
 		data_s = emalloc(data_size + 1);
 		memset(data_s, 0, data_size);
 		memcpy(data_s, Z_STRVAL_PP(data), Z_STRLEN_PP(data));