[gtk-vnc] Abort if mmap of coroutine stack fails

[Daniel P. Berrange <dberrange src gnome org>]

commit b3963416e22382a1fa0ef2d4196f421ef6aee56d
Author: Daniel P. Berrange <berrange redhat com>
Date:   Fri Sep 13 12:05:55 2013 +0100

    Abort if mmap of coroutine stack fails
    
    If we fail to mmap the stack, abort the processs rather
    than returning an error. This is standard practice in
    glib apps, and the caller was not checking the
    coroutine_init() return code leading to memory corruption.
    
    Signed-off-by: Daniel P. Berrange <berrange redhat com>

 src/coroutine_ucontext.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/coroutine_ucontext.c b/src/coroutine_ucontext.c
index a97e2b1..848016e 100644
--- a/src/coroutine_ucontext.c
+++ b/src/coroutine_ucontext.c
@@ -20,6 +20,7 @@
 
 #include <config.h>
 
+#include <glib.h>
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <stdio.h>
@@ -63,7 +64,8 @@ int coroutine_init(struct coroutine *co)
                         MAP_PRIVATE | MAP_ANONYMOUS,
                         -1, 0);
     if (co->cc.stack == MAP_FAILED)
-        return -1;
+        g_error("Failed to allocate %u bytes for coroutine stack",
+                (unsigned)co->stack_size);
     co->cc.entry = coroutine_trampoline;
     co->cc.release = _coroutine_release;
     co->exited = 0;