From: Johan Hovold johan@kernel.org
commit 53f35a39c3860baac1e5ca80bf052751cfb24a99 upstream.
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 Link: https://lore.kernel.org/r/20191202085610.12719-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/isdn/gigaset/usb-gigaset.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/isdn/gigaset/usb-gigaset.c +++ b/drivers/isdn/gigaset/usb-gigaset.c @@ -688,6 +688,11 @@ static int gigaset_probe(struct usb_inte 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 */