linux-kernel - [PATCH 3.16 239/245] [media] drivers/media/media-devnode: clear private_data before put

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Message-ID: <lsq.1587683028.937457411@decadent.org.uk>
Date:   Fri, 24 Apr 2020 00:07:46 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Max Kellermann" <max@...mpel.org>,
        "Mauro Carvalho Chehab" <mchehab@....samsung.com>
Subject: [PATCH 3.16 239/245] [media] drivers/media/media-devnode: clear
 private_data before put_device()

3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Max Kellermann <max@...mpel.org>

commit bf244f665d76d20312c80524689b32a752888838 upstream.

Callbacks invoked from put_device() may free the struct media_devnode
pointer, so any cleanup needs to be done before put_device().

Signed-off-by: Max Kellermann <max@...mpel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/media-devnode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -197,10 +197,11 @@ static int media_release(struct inode *i
 	if (mdev->fops->release)
 		mdev->fops->release(filp);
 
+	filp->private_data = NULL;
+
 	/* decrease the refcount unconditionally since the release()
 	   return value is ignored. */
 	put_device(&mdev->dev);
-	filp->private_data = NULL;
 	return 0;
 }