config-parser: Avoid null dereference when handling config-parser ( when weston starts without config file. )
backtrace:
(gdb) bt
#0 weston_config_next_section (config=0x0, section=0xbfb2b608, name=0xbfb2b618) at config-parser.c:485
#1 0xb75b1371 in x11_compositor_create (config=0x1, argv=0xbfb2ba44, argc=<optimized out>, use_pixman=0, no_input=0, fullscreen=0, display=0xb75b55f9)
at compositor-x11.c:1582
#2 backend_init (display=0x8354490, argc=0xbfb2b9b0, argv=0xbfb2ba44, config=0x0) at compositor-x11.c:1674
#3 0x0804df7b in main (argc=1, argv=0xbfb2ba44) at compositor.c:3289
diff --git a/shared/config-parser.c b/shared/config-parser.c
index 7a19ea5..eec3e9e 100644
--- a/shared/config-parser.c
+++ b/shared/config-parser.c
@@ -481,6 +481,9 @@
struct weston_config_section **section,
const char **name)
{
+ if (config == NULL)
+ return 0;
+
if (*section == NULL)
*section = container_of(config->section_list.next,
struct weston_config_section, link);