[PATCH AUTOSEL for 3.18 074/101] kconfig: Fix automatic menu creation mem leak

[Sasha Levin]

From: Ulf Magnusson 

[ Upstream commit ae7440ef0c8013d68c00dad6900e7cce5311bb1c ]

expr_trans_compare() always allocates and returns a new expression,
giving the following leak outline:

...
*Allocate*
basedep = expr_trans_compare(basedep, E_UNEQUAL, _no);
...
for (menu = parent->next; menu; menu = menu->next) {
...
*Copy*
dep2 = expr_copy(basedep);
...
*Free copy*
expr_free(dep2);
}
*basedep lost!*

Fix by freeing 'basedep' after the loop.

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

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

Summary after the fix:

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

Signed-off-by: Ulf Magnusson 
Signed-off-by: Masahiro Yamada 
Signed-off-by: Sasha Levin 
---
 scripts/kconfig/menu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 72c9dba84c5d..095a6094d736 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -364,6 +364,7 @@ void menu_finalize(struct menu *parent)
menu->parent = parent;
last_menu = menu;
}
+   expr_free(basedep);
if (last_menu) {
parent->list = parent->next;
parent->next = last_menu->next;
-- 
2.15.1

[PATCH AUTOSEL for 3.18 074/101] kconfig: Fix automatic menu creation mem leak

[Sasha Levin]

From: Ulf Magnusson 

[ Upstream commit ae7440ef0c8013d68c00dad6900e7cce5311bb1c ]

expr_trans_compare() always allocates and returns a new expression,
giving the following leak outline:

...
*Allocate*
basedep = expr_trans_compare(basedep, E_UNEQUAL, _no);
...
for (menu = parent->next; menu; menu = menu->next) {
...
*Copy*
dep2 = expr_copy(basedep);
...
*Free copy*
expr_free(dep2);
}
*basedep lost!*

Fix by freeing 'basedep' after the loop.

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

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

Summary after the fix:

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

Signed-off-by: Ulf Magnusson 
Signed-off-by: Masahiro Yamada 
Signed-off-by: Sasha Levin 
---
 scripts/kconfig/menu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 72c9dba84c5d..095a6094d736 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -364,6 +364,7 @@ void menu_finalize(struct menu *parent)
menu->parent = parent;
last_menu = menu;
}
+   expr_free(basedep);
if (last_menu) {
parent->list = parent->next;
parent->next = last_menu->next;
-- 
2.15.1