From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Tue, 11 Dec 2018 11:00:45 +0000 (+0900)
Subject: kconfig: fix memory leak when EOF is encountered in quotation
X-Git-Url: https://jxself.org/git/?p=carl9170fw.git;a=commitdiff_plain;h=779fb16265ed0e9dcb7975ee46f0411fb26d86a3;hp=6b4d2c4d403607081898cef5ff722a9c6509087f

kconfig: fix memory leak when EOF is encountered in quotation

An unterminated string literal followed by new line is passed to the
parser (with "multi-line strings not supported" warning shown), then
handled properly there.

On the other hand, an unterminated string literal at end of file is
never passed to the parser, then results in memory leak.

[Test Code]

  ----------(Kconfig begin)----------
  source "Kconfig.inc"

  config A
          bool "a"
  -----------(Kconfig end)-----------

  --------(Kconfig.inc begin)--------
  config B
          bool "b\No new line at end of file
  ---------(Kconfig.inc end)---------

[Summary from Valgrind]

  Before the fix:

    LEAK SUMMARY:
       definitely lost: 16 bytes in 1 blocks
       ...

  After the fix:

    LEAK SUMMARY:
       definitely lost: 0 bytes in 0 blocks
       ...

Eliminate the memory leak path by handling this case. Of course, such
a Kconfig file is wrong already, so I will add an error message later.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
---

diff --git a/config/zconf.l b/config/zconf.l
index 112a0ee..40ccc13 100644
--- a/config/zconf.l
+++ b/config/zconf.l
@@ -221,6 +221,8 @@ n	[A-Za-z0-9_-]
 	}
 	<<EOF>>	{
 		BEGIN(INITIAL);
+		yylval.string = text;
+		return T_WORD_QUOTE;
 	}
 }