linux-kernel - [PATCH] kconfig: qconf: fix buffer overflow in debug links

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Message-ID: <20241001090226.2784447-1-masahiroy@kernel.org>
Date: Tue,  1 Oct 2024 18:02:22 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: [PATCH] kconfig: qconf: fix buffer overflow in debug links

If you enable the "Option -> Show Debug Info" and click a click, the
program terminates with the following error:

    *** buffer overflow detected ***: terminated

The buffer overflow is caused by the following line:

    strcat(data, "$");

The buffer needs one more byte to accommodate the additional character.

Fixes: c4f7398bee9c ("kconfig: qconf: make debug links work again")
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/kconfig/qconf.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/kconfig/qconf.cc b/scripts/kconfig/qconf.cc
index 7dba8014ead4..e260cab1c2af 100644
--- a/scripts/kconfig/qconf.cc
+++ b/scripts/kconfig/qconf.cc
@@ -1166,7 +1166,7 @@ void ConfigInfoView::clicked(const QUrl &url)
 {
 	QByteArray str = url.toEncoded();
 	const std::size_t count = str.size();
-	char *data = new char[count + 1];
+	char *data = new char[count + 2];  // '$' + '\0'
 	struct symbol **result;
 	struct menu *m = NULL;
 
-- 
2.43.0