linux-kernel - [PATCH 21/28] V4L/DVB (4994): Vivi: fix use after free in list_for

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Message-id: <20061227165731.PS48805300021@infradead.org>
Date:	Wed, 27 Dec 2006 14:57:31 -0200
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	V4L-DVB Maintainers <v4l-dvb-maintainer@...uxtv.org>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>
Subject: [PATCH 21/28] V4L/DVB (4994): Vivi: fix use after free in
	list_for_each()


From: Akinobu Mita <akinobu.mita@...il.com>

Freeing data including list_head in list_for_each() is not safe.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...radead.org>
---

 drivers/media/video/vivi.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index 474ddb7..3cead24 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -1363,7 +1363,9 @@ static void __exit vivi_exit(void)
 	struct vivi_dev *h;
 	struct list_head *list;
 
-	list_for_each(list,&vivi_devlist) {
+	while (!list_empty(&vivi_devlist)) {
+		list = vivi_devlist.next;
+		list_del(list);
 		h = list_entry(list, struct vivi_dev, vivi_devlist);
 		kfree (h);
 	}

-
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