linux-kernel - [PATCH 1/4] staging: gigaset: fix general protection fault on probe

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Date:   Fri, 29 Nov 2019 11:17:50 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        syzbot+35b1c403a14f5c89eba7@...kaller.appspotmail.com,
        stable <stable@...r.kernel.org>, Hansjoerg Lipp <hjlipp@....de>,
        Tilman Schmidt <tilman@...p.cc>
Subject: [PATCH 1/4] staging: gigaset: fix general protection fault on probe

Fix a general protection fault when accessing the endpoint descriptors
which could be triggered by a malicious device due to missing sanity
checks on the number of endpoints.

Reported-by: syzbot+35b1c403a14f5c89eba7@...kaller.appspotmail.com
Fixes: 07dc1f9f2f80 ("[PATCH] isdn4linux: Siemens Gigaset drivers - M105 USB DECT adapter")
Cc: stable <stable@...r.kernel.org>     # 2.6.17
Cc: Hansjoerg Lipp <hjlipp@....de>
Cc: Tilman Schmidt <tilman@...p.cc>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/staging/isdn/gigaset/usb-gigaset.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/staging/isdn/gigaset/usb-gigaset.c b/drivers/staging/isdn/gigaset/usb-gigaset.c
index 1b9b43659bdf..5e393e7dde45 100644
--- a/drivers/staging/isdn/gigaset/usb-gigaset.c
+++ b/drivers/staging/isdn/gigaset/usb-gigaset.c
@@ -685,6 +685,11 @@ static int gigaset_probe(struct usb_interface *interface,
 		return -ENODEV;
 	}
 
+	if (hostif->desc.bNumEndpoints < 2) {
+		dev_err(&interface->dev, "missing endpoints\n");
+		return -ENODEV;
+	}
+
 	dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);
 
 	/* allocate memory for our device state and initialize it */
-- 
2.24.0