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Message-Id: <20200331085440.662743229@linuxfoundation.org>
Date: Tue, 31 Mar 2020 10:59:44 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
Ezequiel Garcia <ezequiel@...labora.com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: [PATCH 5.5 170/170] media: v4l2-core: fix a use-after-free bug of sd->devnode
From: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
commit 6990570f7e0a6078e11b9c5dc13f4b6e3f49a398 upstream.
sd->devnode is released after calling
v4l2_subdev_release. Therefore it should be set
to NULL so that the subdev won't hold a pointer
to a released object. This fixes a reference
after free bug in function
v4l2_device_unregister_subdev
Fixes: 0e43734d4c46e ("media: v4l2-subdev: add release() internal op")
Cc: stable@...r.kernel.org
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
Reviewed-by: Ezequiel Garcia <ezequiel@...labora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/media/v4l2-core/v4l2-device.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -179,6 +179,7 @@ static void v4l2_subdev_release(struct v
if (sd->internal_ops && sd->internal_ops->release)
sd->internal_ops->release(sd);
+ sd->devnode = NULL;
module_put(owner);
}
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