From 8e67b39eb4a3abb6f3e35de3ad6e5d06ed0e8498 Mon Sep 17 00:00:00 2001
From: Paul Pluzhnikov <ppluzhnikov@google.com>
Date: Sat, 1 Sep 2018 10:50:41 -0700
Subject: stdlib: assert on NULL function pointer in atexit etc. [BZ #20544]

---
 stdlib/on_exit.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'stdlib/on_exit.c')

diff --git a/stdlib/on_exit.c b/stdlib/on_exit.c
index 5241e0d86f..1dff7ff631 100644
--- a/stdlib/on_exit.c
+++ b/stdlib/on_exit.c
@@ -15,6 +15,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <assert.h>
 #include <stdlib.h>
 #include "exit.h"
 #include <sysdep.h>
@@ -25,6 +26,10 @@ __on_exit (void (*func) (int status, void *arg), void *arg)
 {
   struct exit_function *new;
 
+  /* As a QoI issue we detect NULL early with an assertion instead
+     of a SIGSEGV at program exit when the handler is run (bug 20544).  */
+  assert (func != NULL);
+
    __libc_lock_lock (__exit_funcs_lock);
   new = __new_exitfn (&__exit_funcs);
 
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