linux-kernel - [PATCH] ath10k: Check return value of ath10k_get_arvif in ath10k_wmi_event_tdls

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Message-Id: <20221003091217.322598-1-pkosyh@yandex.ru>
Date:   Mon,  3 Oct 2022 12:12:17 +0300
From:   Peter Kosyh <pkosyh@...dex.ru>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Peter Kosyh <pkosyh@...dex.ru>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ath10k: Check return value of ath10k_get_arvif in ath10k_wmi_event_tdls_peer

Return value of a function 'ath10k_get_arvif' is dereferenced without
checking for null in ath10k_wmi_event_tdls_peer, but it is usually checked
for this function.

Make ath10k_wmi_event_tdls_peer do check retval of ath10k_get_arvif.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Peter Kosyh <pkosyh@...dex.ru>
---
 drivers/net/wireless/ath/ath10k/wmi-tlv.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/wmi-tlv.c b/drivers/net/wireless/ath/ath10k/wmi-tlv.c
index 876410a47d1d..1f2c37c642ff 100644
--- a/drivers/net/wireless/ath/ath10k/wmi-tlv.c
+++ b/drivers/net/wireless/ath/ath10k/wmi-tlv.c
@@ -585,6 +585,11 @@ static void ath10k_wmi_event_tdls_peer(struct ath10k *ar, struct sk_buff *skb)
 			goto exit;
 		}
 		arvif = ath10k_get_arvif(ar, __le32_to_cpu(ev->vdev_id));
+		if (!arvif) {
+			ath10k_warn(ar, "no vif for vdev_id %d found\n",
+				__le32_to_cpu(ev->vdev_id));
+			goto exit;
+		}
 		ieee80211_tdls_oper_request(
 					arvif->vif, station->addr,
 					NL80211_TDLS_TEARDOWN,
-- 
2.37.0