diff options
authorArnaud Lacombe <lacombar@gmail.com>2011-07-10 03:27:05 -0400
committerMichal Marek <mmarek@suse.cz>2011-07-13 13:48:11 +0200
commitf98ee76955f883abf2ea2a5e5b43deab01734f47 (patch)
parentkconfig/nconf: use the generic menu_get_ext_help() (diff)
kconfig/nconf: prevent segfault on empty menu
nconf does not check the validity of the current menu when help is requested (with either <F2>, '?' or 'h'). This leads to a NULL pointer dereference when an empty menu is encountered. The following reduced testcase exposes the problem: config DEP bool menu "FOO" config BAR bool "BAR" depends on DEP endmenu Issue will happen when entering menu "FOO" and requesting help. nconf is the only front-end which do not filter the validity of the current menu. Such filter can not really happen beforehand as other key which does not deals with the current menu might be entered by the user, so just bails out earlier if we encounter an invalid menu. Cc: Nir Tzachar <nir.tzachar@gmail.com> Cc: Andrej Gelenberg <andrej.gelenberg@udo.edu> Reported-by: Andrej Gelenberg <andrej.gelenberg@udo.edu> Signed-off-by: Arnaud Lacombe <lacombar@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
1 files changed, 6 insertions, 1 deletions
diff --git a/scripts/kconfig/nconf.c b/scripts/kconfig/nconf.c
index d55666d2dd85..d6345df1ce12 100644
--- a/scripts/kconfig/nconf.c
+++ b/scripts/kconfig/nconf.c
@@ -1220,7 +1220,12 @@ static void conf_message_callback(const char *fmt, va_list ap)
static void show_help(struct menu *menu)
- struct gstr help = str_new();
+ struct gstr help;
+ if (!menu)
+ return;
+ help = str_new();
menu_get_ext_help(menu, &help);
show_scroll_win(main_window, _(menu_get_prompt(menu)), str_get(&help));