From: Johan Hovold <johan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: devel@driverdev.osuosl.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org, stable <stable@vger.kernel.org>,
Johan Hovold <johan@kernel.org>, Tilman Schmidt <tilman@imap.cc>,
Hansjoerg Lipp <hjlipp@web.de>,
syzbot+35b1c403a14f5c89eba7@syzkaller.appspotmail.com
Subject: [PATCH v2 1/3] staging: gigaset: fix general protection fault on probe
Date: Mon, 2 Dec 2019 09:56:08 +0100
Message-ID: <20191202085610.12719-2-johan@kernel.org> (raw)
In-Reply-To: <20191202085610.12719-1-johan@kernel.org>
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@syzkaller.appspotmail.com
Fixes: 07dc1f9f2f80 ("[PATCH] isdn4linux: Siemens Gigaset drivers - M105 USB DECT adapter")
Cc: stable <stable@vger.kernel.org> # 2.6.17
Cc: Hansjoerg Lipp <hjlipp@web.de>
Cc: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Johan Hovold <johan@kernel.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
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Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 8:56 [PATCH v2 0/3] staging: gigaset: fix crashes " Johan Hovold
2019-12-02 8:56 ` Johan Hovold [this message]
2019-12-02 8:56 ` [PATCH v2 2/3] staging: gigaset: fix illegal free on probe errors Johan Hovold
2019-12-02 8:56 ` [PATCH v2 3/3] staging: gigaset: add endpoint-type sanity check Johan Hovold
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