linux-kernel - [PATCH] wireless: ath10k: Fix a use after free in ath10k_htc_send

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Date:   Mon, 29 Mar 2021 05:01:54 -0700
From:   Lv Yunlong <lyl2019@...l.ustc.edu.cn>
To:     kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org
Cc:     ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Subject: [PATCH] wireless: ath10k: Fix a use after free in ath10k_htc_send_bundle

In ath10k_htc_send_bundle, the bundle_skb could be freed by
dev_kfree_skb_any(bundle_skb). But the bundle_skb is used later
by bundle_skb->len.

As skb_len = bundle_skb->len, my patch replaces bundle_skb->len to
skb_len after the bundle_skb was freed.

Fixes: c8334512f3dd1 ("ath10k: add htt TX bundle for sdio")
Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
---
 drivers/net/wireless/ath/ath10k/htc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/htc.c b/drivers/net/wireless/ath/ath10k/htc.c
index 0a37be6a7d33..fab398046a3f 100644
--- a/drivers/net/wireless/ath/ath10k/htc.c
+++ b/drivers/net/wireless/ath/ath10k/htc.c
@@ -669,7 +669,7 @@ static int ath10k_htc_send_bundle(struct ath10k_htc_ep *ep,
 
 	ath10k_dbg(ar, ATH10K_DBG_HTC,
 		   "bundle tx status %d eid %d req count %d count %d len %d\n",
-		   ret, ep->eid, skb_queue_len(&ep->tx_req_head), cn, bundle_skb->len);
+		   ret, ep->eid, skb_queue_len(&ep->tx_req_head), cn, skb_len);
 	return ret;
 }
 
-- 
2.25.1