php/php-src — pull request #848 by thekid (2014-09-27 19:36:59+00:00)
Title: Fix segmentation fault in debug_backtrace()

This pull request fixes a segmentation fault in `debug_backtrace()` by adding a NULL-check for `call->func`. Here's a bit of context from Zend/zend_builtin_functions.c

```c
object = call ? call->object : NULL;
if (object &&
call->func && /* <-- This is the added line */
call->func->type == ZEND_INTERNAL_FUNCTION &&
!call->func->common.scope) {
object = NULL;
}

if (call && call->func) { /* This is what it's consistent with */
// ...
} else {
func = NULL;
function_name = NULL;
}
```