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kconfig: Fix expr_free() E_NOT leak

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[ Upstream commit 5b1374b3b3c2fc4f63a398adfa446fb8eff791a4 ]

Only the E_NOT operand and not the E_NOT node itself was freed, due to
accidentally returning too early in expr_free(). Outline of leak:

	switch (e->type) {
	...
	case E_NOT:
		expr_free(e->left.expr);
		return;
	...
	}
	*Never reached, 'e' leaked*
	free(e);

Fix by changing the 'return' to a 'break'.

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

	LEAK SUMMARY:
	   definitely lost: 44,448 bytes in 1,852 blocks
	   ...

Summary after the fix:

	LEAK SUMMARY:
	   definitely lost: 1,608 bytes in 67 blocks
	   ...

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ulf Magnusson 2017-10-08 19:35:45 +02:00 committed by Greg Kroah-Hartman
parent 921fcd9436
commit 5bfe39f17d
1 changed files with 1 additions and 1 deletions
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2
scripts/kconfig/expr.c
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@ -113,7 +113,7 @@ void expr_free(struct expr *e)
break;
case E_NOT:
expr_free(e->left.expr);
return;
break;
case E_EQUAL:
case E_GEQ:
case E_GTH: