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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>
This commit is contained in:
Arnaud Lacombe 2011-07-10 03:27:05 -04:00 committed by Michal Marek
parent 5416857867
commit f98ee76955
1 changed files with 6 additions and 1 deletions
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7
scripts/kconfig/nconf.c
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@ -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));
str_free(&help);