kconfig: Don't leak main menus during parsing
[ Upstream commit 0724a7c32a54e3e50d28e19e30c59014f61d4e2c ]
If a 'mainmenu' entry appeared in the Kconfig files, two things would
leak:
- The 'struct property' allocated for the default "Linux Kernel
Configuration" prompt.
- The string for the T_WORD/T_WORD_QUOTE prompt after the
T_MAINMENU token, allocated on the heap in zconf.l.
To fix it, introduce a new 'no_mainmenu_stmt' nonterminal that matches
if there's no 'mainmenu' and adds the default prompt. That means the
prompt only gets allocated once regardless of whether there's a
'mainmenu' statement or not, and managing it becomes simple.
Summary from Valgrind on 'menuconfig' (ARCH=x86) before the fix:
LEAK SUMMARY:
definitely lost: 344,568 bytes in 14,352 blocks
...
Summary after the fix:
LEAK SUMMARY:
definitely lost: 344,440 bytes in 14,350 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>
1 file changed