ath10k: sanitity check for ep connectivity

Function ep_rx_complete is being called without NULL checking
in ath10k_htc_rx_completion_handler. Without such check, mal-
formed packet is able to cause jump to NULL.

ep->service_id seems a good candidate for sanity check as it is
used in usb.c.

Signed-off-by: Zekun Shen <bruceshenzk@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200622022055.16028-1-bruceshenzk@gmail.com

diff --git a/drivers/net/wireless/ath/ath10k/htc.c b/drivers/net/wireless/ath/ath10k/htc.c
index 31df6dd..0a37be6 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/htc.c
+++ b/drivers/net/wireless/ath/ath10k/htc.c
@@ -449,6 +449,10 @@ void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
        }
 
        ep = &htc->endpoint[eid];
+       if (ep->service_id == ATH10K_HTC_SVC_ID_UNUSED) {
+               ath10k_warn(ar, "htc rx endpoint %d is not connected\n", eid);
+               goto out;
+       }
 
        payload_len = __le16_to_cpu(hdr->len);