netdev - [PATCH AUTOSEL 4.19 36/56] r8152: add missing endpoint sanity check

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Message-Id: <20200124142012.29752-36-sashal@kernel.org>
Date:   Fri, 24 Jan 2020 09:19:52 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Johan Hovold <johan@...nel.org>, hayeswang <hayeswang@...ltek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 36/56] r8152: add missing endpoint sanity check

From: Johan Hovold <johan@...nel.org>

[ Upstream commit 86f3f4cd53707ceeec079b83205c8d3c756eca93 ]

Add missing endpoint sanity check to probe in order to prevent a
NULL-pointer dereference (or slab out-of-bounds access) when retrieving
the interrupt-endpoint bInterval on ndo_open() in case a device lacks
the expected endpoints.

Fixes: 40a82917b1d3 ("net/usb/r8152: enable interrupt transfer")
Cc: hayeswang <hayeswang@...ltek.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/usb/r8152.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 91d47a714afdf..db817d3c2bb8b 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -5167,6 +5167,9 @@ static int rtl8152_probe(struct usb_interface *intf,
 		return -ENODEV;
 	}
 
+	if (intf->cur_altsetting->desc.bNumEndpoints < 3)
+		return -ENODEV;
+
 	usb_reset_device(udev);
 	netdev = alloc_etherdev(sizeof(struct r8152));
 	if (!netdev) {
-- 
2.20.1