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Message-Id: <20170523200821.876781125@linuxfoundation.org>
Date: Tue, 23 May 2017 22:06:05 +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, Johan Hovold <johan@...nel.org>,
Guenter Roeck <linux@...ck-us.net>,
Wim Van Sebroeck <wim@...ana.be>
Subject: [PATCH 4.11 004/197] watchdog: pcwd_usb: fix NULL-deref at probe
4.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan@...nel.org>
commit 46c319b848268dab3f0e7c4a5b6e9146d3bca8a4 upstream.
Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@...nel.org>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@...ana.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/watchdog/pcwd_usb.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/watchdog/pcwd_usb.c
+++ b/drivers/watchdog/pcwd_usb.c
@@ -630,6 +630,9 @@ static int usb_pcwd_probe(struct usb_int
return -ENODEV;
}
+ if (iface_desc->desc.bNumEndpoints < 1)
+ return -ENODEV;
+
/* check out the endpoint: it has to be Interrupt & IN */
endpoint = &iface_desc->endpoint[0].desc;
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