Fixed bug #78488 (OOB in ZEND_FUNCTION(ffi_trampoline)).

Author: dstogov

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 7.4.0RC2
 
+- FFI:
+  . Fixed bug #78488 (OOB in ZEND_FUNCTION(ffi_trampoline)). (Dmitry)
+
 - Opcache:
   . Add opcache.preload_user INI directive. (Dmitry)
 

ext/ffi/ffi.c

@@ -160,6 +160,9 @@ typedef struct _zend_ffi {
 #define ZEND_FFI_TYPE_MAKE_OWNED(t) \
 	((zend_ffi_type*)(((uintptr_t)(t)) | ZEND_FFI_TYPE_OWNED))
 
+#define ZEND_FFI_SIZEOF_ARG \
+	MAX(FFI_SIZEOF_ARG, sizeof(double))
+
 typedef struct _zend_ffi_cdata {
 	zend_object            std;
 	zend_ffi_type         *type;
@@ -2614,12 +2617,12 @@ static ZEND_FUNCTION(ffi_trampoline) /* {{{ */
 			arg_types = do_alloca(
 				sizeof(ffi_type*) * EX_NUM_ARGS(), arg_types_use_heap);
 			arg_values = do_alloca(
-				(sizeof(void*) + FFI_SIZEOF_ARG) * EX_NUM_ARGS(), arg_values_use_heap);
+				(sizeof(void*) + ZEND_FFI_SIZEOF_ARG) * EX_NUM_ARGS(), arg_values_use_heap);
 			n = 0;
 			if (type->func.args) {
 				ZEND_HASH_FOREACH_PTR(type->func.args, arg_type) {
 					arg_type = ZEND_FFI_TYPE(arg_type);
-					arg_values[n] = ((char*)arg_values) + (sizeof(void*) * EX_NUM_ARGS()) + (FFI_SIZEOF_ARG * n);
+					arg_values[n] = ((char*)arg_values) + (sizeof(void*) * EX_NUM_ARGS()) + (ZEND_FFI_SIZEOF_ARG * n);
 					if (zend_ffi_pass_arg(EX_VAR_NUM(n), arg_type, &arg_types[n], arg_values, n, execute_data) != SUCCESS) {
 						free_alloca(arg_types, arg_types_use_heap);
 						free_alloca(arg_values, arg_values_use_heap);
@@ -2629,7 +2632,7 @@ static ZEND_FUNCTION(ffi_trampoline) /* {{{ */
 				} ZEND_HASH_FOREACH_END();
 			}
 			for (; n < EX_NUM_ARGS(); n++) {
-				arg_values[n] = ((char*)arg_values) + (sizeof(void*) * EX_NUM_ARGS()) + (FFI_SIZEOF_ARG * n);
+				arg_values[n] = ((char*)arg_values) + (sizeof(void*) * EX_NUM_ARGS()) + (ZEND_FFI_SIZEOF_ARG * n);
 				if (zend_ffi_pass_var_arg(EX_VAR_NUM(n), &arg_types[n], arg_values, n, execute_data) != SUCCESS) {
 					free_alloca(arg_types, arg_types_use_heap);
 					free_alloca(arg_values, arg_values_use_heap);
@@ -2659,12 +2662,12 @@ static ZEND_FUNCTION(ffi_trampoline) /* {{{ */
 			arg_types = do_alloca(
 				(sizeof(ffi_type*) + sizeof(ffi_type)) * EX_NUM_ARGS(), arg_types_use_heap);
 			arg_values = do_alloca(
-				(sizeof(void*) + FFI_SIZEOF_ARG) * EX_NUM_ARGS(), arg_values_use_heap);
+				(sizeof(void*) + ZEND_FFI_SIZEOF_ARG) * EX_NUM_ARGS(), arg_values_use_heap);
 			n = 0;
 			if (type->func.args) {
 				ZEND_HASH_FOREACH_PTR(type->func.args, arg_type) {
 					arg_type = ZEND_FFI_TYPE(arg_type);
-					arg_values[n] = ((char*)arg_values) + (sizeof(void*) * EX_NUM_ARGS()) + (FFI_SIZEOF_ARG * n);
+					arg_values[n] = ((char*)arg_values) + (sizeof(void*) * EX_NUM_ARGS()) + (ZEND_FFI_SIZEOF_ARG * n);
 					if (zend_ffi_pass_arg(EX_VAR_NUM(n), arg_type, &arg_types[n], arg_values, n, execute_data) != SUCCESS) {
 						free_alloca(arg_types, arg_types_use_heap);
 						free_alloca(arg_values, arg_values_use_heap);