zd1211rw: fix NULL-deref at probe
authorJohan Hovold <johan@kernel.org>
Mon, 13 Mar 2017 12:44:21 +0000 (13:44 +0100)
committerKalle Valo <kvalo@codeaurora.org>
Wed, 22 Mar 2017 09:03:37 +0000 (11:03 +0200)
Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory beyond the endpoint array should a
malicious device lack the expected endpoints.

Fixes: a1030e92c150 ("[PATCH] zd1211rw: Convert installer CDROM device into WLAN device")
Cc: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
drivers/net/wireless/zydas/zd1211rw/zd_usb.c

index c5effd6c6be9beea8481d3c1a68e57f5ace403cf..01ca1d57b3d92074d2953195b9776b368f653ead 100644 (file)
@@ -1278,6 +1278,9 @@ static int eject_installer(struct usb_interface *intf)
        u8 bulk_out_ep;
        int r;
 
+       if (iface_desc->desc.bNumEndpoints < 2)
+               return -ENODEV;
+
        /* Find bulk out endpoint */
        for (r = 1; r >= 0; r--) {
                endpoint = &iface_desc->endpoint[r].desc;