[PATCH 3.2 10/59] zd1211rw: fix NULL-deref at probe

[Ben Hutchings]

3.2.92-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jo...@kernel.org>

commit ca260ece6a57dc7d751e0685f51fa2c55d851873 upstream.

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 <d...@gentoo.org>
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/net/wireless/zd1211rw/zd_usb.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -1281,6 +1281,9 @@ static int eject_installer(struct usb_in
        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;