From 7a263a0402561035199cd9049baadb908a92b6b4 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Mon, 24 Oct 2022 04:10:55 +0900 Subject: [PATCH] kconfig: fix segmentation fault in menuconfig search Since commit d05377e184fc ("kconfig: Create links to main menu items in search"), menuconfig shows a jump key next to "Main menu" if the nearest visible parent is the rootmenu. If you press that jump key, menuconfig crashes with a segmentation fault. For example, do this: $ make ARCH=arm64 allnoconfig menuconfig Press '/' to search for the string "ACPI". Press '1' to choose "(1) Main menu". Then, menuconfig crashed with a segmentation fault. The following code in search_conf() conf(targets[i]->parent, targets[i]); results in NULL pointer dereference because targets[i] is the rootmenu, which does not have a parent. Commit d05377e184fc tried to fix the issue of top-level items not having a jump key, but adding the "Main menu" was not the right fix. The correct fix is to show the searched item itself. This fixes another weird behavior described in the comment block. Fixes: d05377e184fc ("kconfig: Create links to main menu items in search") Reported-by: Johannes Zink Signed-off-by: Masahiro Yamada Tested-by: Bagas Sanjaya Tested-by: Johannes Zink --- scripts/kconfig/menu.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c index 62b6313f51c8..109325f31bef 100644 --- a/scripts/kconfig/menu.c +++ b/scripts/kconfig/menu.c @@ -722,8 +722,8 @@ static void get_prompt_str(struct gstr *r, struct property *prop, if (!expr_eq(prop->menu->dep, prop->visible.expr)) get_dep_str(r, prop->visible.expr, " Visible if: "); - menu = prop->menu->parent; - for (i = 0; menu && i < 8; menu = menu->parent) { + menu = prop->menu; + for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) { bool accessible = menu_is_visible(menu); submenu[i++] = menu; @@ -733,16 +733,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop, if (head && location) { jump = xmalloc(sizeof(struct jump_key)); - if (menu_is_visible(prop->menu)) { - /* - * There is not enough room to put the hint at the - * beginning of the "Prompt" line. Put the hint on the - * last "Location" line even when it would belong on - * the former. - */ - jump->target = prop->menu; - } else - jump->target = location; + jump->target = location; if (list_empty(head)) jump->index = 0; @@ -758,13 +749,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop, menu = submenu[i]; if (jump && menu == location) jump->offset = strlen(r->s); - - if (menu == &rootmenu) - /* The real rootmenu prompt is ugly */ - str_printf(r, "%*cMain menu", j, ' '); - else - str_printf(r, "%*c-> %s", j, ' ', menu_get_prompt(menu)); - + str_printf(r, "%*c-> %s", j, ' ', menu_get_prompt(menu)); if (menu->sym) { str_printf(r, " (%s [=%s])", menu->sym->name ? menu->sym->name : "",