From 01e717b3c141c509a7200b0a6c560f75815c08f2 Mon Sep 17 00:00:00 2001 From: "Richard W.M. Jones" Date: Mon, 9 Jan 2012 16:55:49 +0000 Subject: [PATCH] daemon: debug segv correct use of dereferencing NULL. --- daemon/debug.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/daemon/debug.c b/daemon/debug.c index 31cef46..522012f 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; } -- 1.8.3.1