From: Johan Hovold <johan@xxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 07dc1f9f2f80 ("[PATCH] isdn4linux: Siemens Gigaset drivers - M105 USB DECT adapter")
Cc: stable <stable@xxxxxxxxxxxxxxx> # 2.6.17
Cc: Hansjoerg Lipp <hjlipp@xxxxxx>
Cc: Tilman Schmidt <tilman@xxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20191202085610.12719-2-johan@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/isdn/gigaset/usb-gigaset.c | 5 +++++
1 file changed, 5 insertions(+)
--- 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_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 */
