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 */