[PATCH 4.11 050/197] ath9k_htc: fix NULL-deref at probe

From: Greg Kroah-Hartman
Date: Tue May 23 2017 - 16:16:00 EST


4.11-stable review patch. If anyone has any objections, please let me know.

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

From: Johan Hovold <johan@xxxxxxxxxx>

commit ebeb36670ecac36c179b5fb5d5c88ff03ba191ec 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: 36bcce430657 ("ath9k_htc: Handle storage devices")
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/net/wireless/ath/ath9k/hif_usb.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -1220,6 +1220,9 @@ static int send_eject_command(struct usb
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;