linux-kernel - [PATCH 5.10 273/299] media: dvbdev: Fix memory leak in dvb_media_device

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Date:   Mon, 10 May 2021 12:21:10 +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,
        syzbot+7f09440acc069a0d38ac@...kaller.appspotmail.com,
        Peilin Ye <yepeilin.cs@...il.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: [PATCH 5.10 273/299] media: dvbdev: Fix memory leak in dvb_media_device_free()

From: Peilin Ye <yepeilin.cs@...il.com>

commit bf9a40ae8d722f281a2721779595d6df1c33a0bf upstream.

dvb_media_device_free() is leaking memory. Free `dvbdev->adapter->conn`
before setting it to NULL, as documented in include/media/media-device.h:
"The media_entity instance itself must be freed explicitly by the driver
if required."

Link: https://syzkaller.appspot.com/bug?id=9bbe4b842c98f0ed05c5eed77a226e9de33bf298

Link: https://lore.kernel.org/linux-media/20201211083039.521617-1-yepeilin.cs@gmail.com
Cc: stable@...r.kernel.org
Fixes: 0230d60e4661 ("[media] dvbdev: Add RF connector if needed")
Reported-by: syzbot+7f09440acc069a0d38ac@...kaller.appspotmail.com
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/dvb-core/dvbdev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -241,6 +241,7 @@ static void dvb_media_device_free(struct
 
 	if (dvbdev->adapter->conn) {
 		media_device_unregister_entity(dvbdev->adapter->conn);
+		kfree(dvbdev->adapter->conn);
 		dvbdev->adapter->conn = NULL;
 		kfree(dvbdev->adapter->conn_pads);
 		dvbdev->adapter->conn_pads = NULL;