linux-kernel - [PATCH] net: ath10k: santity check for ep connectivity

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Date:   Sun, 21 Jun 2020 22:20:54 -0400
From:   Zekun Shen <bruceshenzk@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zekun Shen <bruceshenzk@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: ath10k: santity 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@...il.com>
---
 drivers/net/wireless/ath/ath10k/htc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/htc.c b/drivers/net/wireless/ath/ath10k/htc.c
index 31df6dd04..e00794d97 100644
--- a/drivers/net/wireless/ath/ath10k/htc.c
+++ b/drivers/net/wireless/ath/ath10k/htc.c
@@ -450,6 +450,11 @@ void ath10k_htc_rx_completion_handler(struct ath10k *ar, struct sk_buff *skb)
 
 	ep = &htc->endpoint[eid];
 
+	if (ep->service_id == 0) {
+		ath10k_warn(ar, "HTC Rx: ep %d is not connect\n", eid);
+		goto out;
+	}
+
 	payload_len = __le16_to_cpu(hdr->len);
 
 	if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
-- 
2.17.1