linux-kernel - [PATCH 01/12] [media] rc-main: clear rc_map.name in ir_free

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Date:	Tue, 09 Aug 2016 23:32:06 +0200
From:	Max Kellermann <max.kellermann@...il.com>
To:	linux-media@...r.kernel.org, shuahkh@....samsung.com,
	mchehab@....samsung.com
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 01/12] [media] rc-main: clear rc_map.name in ir_free_table()

rc_unregister_device() will first call ir_free_table(), and later
device_del(); however, the latter causes a call to rc_dev_uevent(),
which prints rc_map.name, which at this point has already bee freed.

This fixes a use-after-free bug found with KASAN.

Signed-off-by: Max Kellermann <max.kellermann@...il.com>
---
 drivers/media/rc/rc-main.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 8e7f292..1e5a520 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -159,6 +159,7 @@ static void ir_free_table(struct rc_map *rc_map)
 {
 	rc_map->size = 0;
 	kfree(rc_map->name);
+	rc_map->name = NULL;
 	kfree(rc_map->scan);
 	rc_map->scan = NULL;
 }