Thread (3 messages) 3 messages, 2 authors, 2021-04-22

[PATCH] wireless: ath10k: Fix a use after free in ath10k_htc_send_bundle

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STALE2013d LANDED

From: Lv Yunlong <hidden>
Date: 2021-03-29 12:02:55
Also in: linux-wireless, lkml
Subsystem: atheros ath generic utilities, qualcomm atheros ath10k wireless driver, the rest · Maintainers: Jeff Johnson, Linus Torvalds

Status: Landed in mainline as 8392df5d7e0b on 2021-04-22.

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 <redacted>
---
 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

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