linux-kernel - [PATCH] ath10k: Fix ath10k_wmi_tlv_op_pull_peer_stats

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Message-Id: <20210406230228.31301-1-skhan@linuxfoundation.org>
Date:   Tue,  6 Apr 2021 17:02:28 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org
Cc:     Shuah Khan <skhan@...uxfoundation.org>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, pavel@....cz
Subject: [PATCH] ath10k: Fix ath10k_wmi_tlv_op_pull_peer_stats_info() unlock without lock

ath10k_wmi_tlv_op_pull_peer_stats_info() could try to unlock RCU lock
winthout locking it first when peer reason doesn't match the valid
cases for this function.

Add a default case to return without unlocking.

Fixes: 09078368d516 ("ath10k: hold RCU lock when calling ieee80211_find_sta_by_ifaddr()")
Reported-by: Pavel Machek <pavel@....cz>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
---
 drivers/net/wireless/ath/ath10k/wmi-tlv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/wmi-tlv.c b/drivers/net/wireless/ath/ath10k/wmi-tlv.c
index d97b33f789e4..7efbe03fbca8 100644
--- a/drivers/net/wireless/ath/ath10k/wmi-tlv.c
+++ b/drivers/net/wireless/ath/ath10k/wmi-tlv.c
@@ -592,6 +592,9 @@ static void ath10k_wmi_event_tdls_peer(struct ath10k *ar, struct sk_buff *skb)
 					GFP_ATOMIC
 					);
 		break;
+	default:
+		kfree(tb);
+		return;
 	}
 
 exit:
-- 
2.27.0