linux-kernel - [PATCH AUTOSEL 4.4 02/33] media: ati_remote: sanity check for both endpoints

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Date:   Sun, 18 Oct 2020 15:26:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Oliver Neukum <oneukum@...e.com>,
        syzbot+998261c2ae5932458f6c@...kaller.appspotmail.com,
        Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 02/33] media: ati_remote: sanity check for both endpoints

From: Oliver Neukum <oneukum@...e.com>

[ Upstream commit a8be80053ea74bd9c3f9a3810e93b802236d6498 ]

If you do sanity checks, you should do them for both endpoints.
Hence introduce checking for endpoint type for the output
endpoint, too.

Reported-by: syzbot+998261c2ae5932458f6c@...kaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/rc/ati_remote.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/rc/ati_remote.c b/drivers/media/rc/ati_remote.c
index a35631891cc00..3c3f4c4f6be40 100644
--- a/drivers/media/rc/ati_remote.c
+++ b/drivers/media/rc/ati_remote.c
@@ -843,6 +843,10 @@ static int ati_remote_probe(struct usb_interface *interface,
 		err("%s: endpoint_in message size==0? \n", __func__);
 		return -ENODEV;
 	}
+	if (!usb_endpoint_is_int_out(endpoint_out)) {
+		err("%s: Unexpected endpoint_out\n", __func__);
+		return -ENODEV;
+	}
 
 	ati_remote = kzalloc(sizeof (struct ati_remote), GFP_KERNEL);
 	rc_dev = rc_allocate_device();
-- 
2.25.1