linux-kernel - [PATCH 2/2] kconfig: qconf: remove wrong ConfigList::firstChild()

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Date:   Sat,  1 Aug 2020 16:08:50 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] kconfig: qconf: remove wrong ConfigList::firstChild()

This function returns the first child object, but the returned pointer
is not compatible with (ConfigItem *).

Commit cc1c08edccaf ("kconfig: qconf: don't show goback button on
splitMode") uncovered this because using the pointer from this function
would make qconf crash. (https://lkml.org/lkml/2020/7/18/411)

This function does not work. Do not use it.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/kconfig/qconf.cc | 2 +-
 scripts/kconfig/qconf.h  | 4 ----
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/scripts/kconfig/qconf.cc b/scripts/kconfig/qconf.cc
index 75c7b57fd7a9..80f042a337c2 100644
--- a/scripts/kconfig/qconf.cc
+++ b/scripts/kconfig/qconf.cc
@@ -443,7 +443,7 @@ void ConfigList::updateList(ConfigItem* item)
 	}
 	if ((mode == singleMode || (mode == symbolMode && !(rootEntry->flags & MENU_ROOT))) &&
 	    rootEntry->sym && rootEntry->prompt) {
-		item = last ? last->nextSibling() : firstChild();
+		item = last ? last->nextSibling() : nullptr;
 		if (!item)
 			item = new ConfigItem(this, last, rootEntry, true);
 		else
diff --git a/scripts/kconfig/qconf.h b/scripts/kconfig/qconf.h
index fb9e9729266f..5eeab4a8bb43 100644
--- a/scripts/kconfig/qconf.h
+++ b/scripts/kconfig/qconf.h
@@ -92,10 +92,6 @@ public slots:
 	{
 		return this;
 	}
-	ConfigItem* firstChild() const
-	{
-		return (ConfigItem *)children().first();
-	}
 	void addColumn(colIdx idx)
 	{
 		showColumn(idx);
-- 
2.25.1