From a4a42881ef741caba593a297a892d9d08066ab0c Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Mon, 9 Jan 2012 16:55:49 +0000
Subject: daemon: debug segv correct use of dereferencing NULL. (cherry picked
 from commit 01e717b3c141c509a7200b0a6c560f75815c08f2)

---
 daemon/debug.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/daemon/debug.c b/daemon/debug.c
index bb91c9ef..2946662d 100644
--- a/daemon/debug.c
+++ b/daemon/debug.c
@@ -198,7 +198,13 @@ debug_fds (const char *subcmd, int argc, char *const *const argv)
 static char *
 debug_segv (const char *subcmd, int argc, char *const *const argv)
 {
-  *(int*)0 = 0;
+  /* http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
+   * "Dereferencing a NULL Pointer: contrary to popular belief,
+   * dereferencing a null pointer in C is undefined. It is not defined
+   * to trap [...]"
+   */
+  volatile int *ptr = NULL;
+  *ptr = 1;
   return NULL;
 }
 
-- 
cgit