linux-kernel - [PATCH 5/6] kconfig: Don't leak help strings during parsing

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Date:   Sun,  8 Oct 2017 19:11:22 +0200
From:   Ulf Magnusson <ulfalizer@...il.com>
To:     yann.morin.1998@...e.fr, linux-kbuild@...r.kernel.org
Cc:     sam@...nborg.org, zippel@...ux-m68k.org, nicolas.pitre@...aro.org,
        michal.lkml@...kovi.net, dirk@...ders.net,
        yamada.masahiro@...ionext.com, lacombar@...il.com,
        walch.martin@....de, JBeulich@...e.com,
        linux-kernel@...r.kernel.org, Ulf Magnusson <ulfalizer@...il.com>
Subject: [PATCH 5/6] kconfig: Don't leak help strings during parsing

This is just for completeness to get rid of the last memory leak
currently generated during parsing for ARCH=x86. The symbol
DVB_NETUP_UNIDVB in drivers/media/pci/netup_unidvb/Kconfig currently has
two help strings, and we leak the first one.

Summary from Valgrind on 'menuconfig' (ARCH=x86) before the fix:

	LEAK SUMMARY:
	   definitely lost: 344,440 bytes in 14,350 blocks
	   ...

Summary after the fix:

	LEAK SUMMARY:
	   definitely lost: 344,376 bytes in 14,349 blocks
	   ...

Signed-off-by: Ulf Magnusson <ulfalizer@...il.com>
---
 scripts/kconfig/zconf.y | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
index 468ab03..3c9f436 100644
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -435,6 +435,9 @@ help_start: T_HELP T_EOL
 
 help: help_start T_HELPTEXT
 {
+	if (current_entry->help)
+		/* Weird menu node with two help strings */
+		free(current_entry->help);
 	current_entry->help = $2;
 };
 
-- 
2.7.4