netdev - [PATCH][net-next] mac80211: add missing null return check from call to ieee80211_get

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Message-Id: <20190730143205.14261-1-colin.king@canonical.com>
Date:   Tue, 30 Jul 2019 15:32:05 +0100
From:   Colin King <colin.king@...onical.com>
To:     John Crispin <john@...ozen.org>,
        Johannes Berg <johannes@...solutions.net>,
        "David S . Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][net-next] mac80211: add missing null return check from call to ieee80211_get_sband

From: Colin Ian King <colin.king@...onical.com>

The return from ieee80211_get_sband can potentially be a null pointer, so
it seems prudent to add a null check to avoid a null pointer dereference
on sband.

Addresses-Coverity: ("Dereference null return")
Fixes: 2ab45876756f ("mac80211: add support for the ADDBA extension element")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 net/mac80211/agg-rx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index 0e1bb43973b8..4d1c335e06e5 100644
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -189,6 +189,8 @@ static void ieee80211_add_addbaext(struct ieee80211_sub_if_data *sdata,
 	u8 *pos;
 
 	sband = ieee80211_get_sband(sdata);
+	if (!sband)
+		return;
 	he_cap = ieee80211_get_he_iftype_cap(sband, sdata->vif.type);
 	if (!he_cap)
 		return;
-- 
2.20.1