kconfig: Fix choice symbol expression leak
When propagating dependencies from parents after parsing, an expression
node is allocated if the parent symbol is a 'choice'. This node was
never freed.
Outline of leak:
if (sym && sym_is_choice(sym)) {
...
*Allocate (in this case only)*
parentdep = expr_alloc_symbol(sym);
} else if (parent->prompt)
parentdep = parent->prompt->visible.expr;
else
parentdep = parent->dep;
for (menu = parent->list; menu; menu = menu->next) {
...
*Copy*
basedep = expr_alloc_and(expr_copy(parentdep), basedep);
...
}
*parentdep lost if the parent is a choice!*
Fix by freeing 'parentdep' after the loop if the parent symbol is a
choice. Note that this only frees the expression node and not the choice
symbol itself.
Summary from Valgrind on 'menuconfig' (ARCH=x86) before the fix:
LEAK SUMMARY:
definitely lost: 1,608 bytes in 67 blocks
...
Summary after the fix:
LEAK SUMMARY:
definitely lost: 0 bytes in 0 blocks
...
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 5b24159..41c79be 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -408,6 +408,9 @@ void menu_finalize(struct menu *parent)
}
}
+ if (sym && sym_is_choice(sym))
+ expr_free(parentdep);
+
/*
* Recursively process children in the same fashion before
* moving on
