linux-kernel - [PATCH 1/2] menuconfig: Fix memory leak introduced by jump keys feature

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Date:	Mon, 15 Apr 2013 10:13:50 -0400
From:	Benjamin Poirier <bpoirier@...e.de>
To:	Michal Marek <mmarek@...e.cz>
Cc:	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	Wang YanQing <udknight@...il.com>,
	Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] menuconfig: Fix memory leak introduced by jump keys feature

Fixes the memory leak of struct jump_key allocated in get_prompt_str()

Signed-off-by: Benjamin Poirier <bpoirier@...e.de>
---
 scripts/kconfig/list.h  |   13 +++++++++++++
 scripts/kconfig/mconf.c |    3 +++
 2 files changed, 16 insertions(+)

diff --git a/scripts/kconfig/list.h b/scripts/kconfig/list.h
index 0ae730b..b87206c 100644
--- a/scripts/kconfig/list.h
+++ b/scripts/kconfig/list.h
@@ -51,6 +51,19 @@ struct list_head {
 	     pos = list_entry(pos->member.next, typeof(*pos), member))
 
 /**
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member)			\
+	for (pos = list_entry((head)->next, typeof(*pos), member),	\
+		n = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head);					\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
  * list_empty - tests whether a list is empty
  * @head: the list to test.
  */
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index 566288a..c5418d6 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -389,6 +389,7 @@ again:
 			.targets = targets,
 			.keys = keys,
 		};
+		struct jump_key *pos, *tmp;
 
 		res = get_relations_str(sym_arr, &head);
 		dres = show_textbox_ext(_("Search Results"), (char *)
@@ -402,6 +403,8 @@ again:
 				again = true;
 			}
 		str_free(&res);
+		list_for_each_entry_safe(pos, tmp, &head, entries)
+			free(pos);
 	} while (again);
 	free(sym_arr);
 	str_free(&title);
-- 
1.7.10.4

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