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From: Colin King <colin.king@canonical.com>
To: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>,
	Ryder Lee <ryder.lee@mediatek.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH][next] mt76: mt7615: Fix a dereference of pointer sta before it is null checked
Date: Mon, 19 Apr 2021 14:20:32 +0100	[thread overview]
Message-ID: <20210419132032.177788-1-colin.king@canonical.com> (raw)

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

Currently the assignment of idx dereferences pointer sta before
sta is null checked, leading to a potential null pointer dereference.
Fix this by assigning idx when it is required after the null check on
pointer sta.

Addresses-Coverity: ("Dereference before null check")
Fixes: a4a5a430b076 ("mt76: mt7615: fix TSF configuration")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
index 4a370b9f7a17..f8d3673c2cae 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
@@ -67,7 +67,7 @@ static int mt7663_usb_sdio_set_rates(struct mt7615_dev *dev,
 	struct mt7615_rate_desc *rate = &wrd->rate;
 	struct mt7615_sta *sta = wrd->sta;
 	u32 w5, w27, addr, val;
-	u16 idx = sta->vif->mt76.omac_idx;
+	u16 idx;
 
 	lockdep_assert_held(&dev->mt76.mutex);
 
@@ -119,6 +119,7 @@ static int mt7663_usb_sdio_set_rates(struct mt7615_dev *dev,
 
 	sta->rate_probe = sta->rateset[rate->rateset].probe_rate.idx != -1;
 
+	idx = sta->vif->mt76.omac_idx;
 	idx = idx > HW_BSSID_MAX ? HW_BSSID_0 : idx;
 	addr = idx > 1 ? MT_LPON_TCR2(idx): MT_LPON_TCR0(idx);
 
-- 
2.30.2


WARNING: multiple messages have this Message-ID (diff)
From: Colin King <colin.king@canonical.com>
To: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>,
	Ryder Lee <ryder.lee@mediatek.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH][next] mt76: mt7615: Fix a dereference of pointer sta before it is null checked
Date: Mon, 19 Apr 2021 14:20:32 +0100	[thread overview]
Message-ID: <20210419132032.177788-1-colin.king@canonical.com> (raw)

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

Currently the assignment of idx dereferences pointer sta before
sta is null checked, leading to a potential null pointer dereference.
Fix this by assigning idx when it is required after the null check on
pointer sta.

Addresses-Coverity: ("Dereference before null check")
Fixes: a4a5a430b076 ("mt76: mt7615: fix TSF configuration")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
index 4a370b9f7a17..f8d3673c2cae 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
@@ -67,7 +67,7 @@ static int mt7663_usb_sdio_set_rates(struct mt7615_dev *dev,
 	struct mt7615_rate_desc *rate = &wrd->rate;
 	struct mt7615_sta *sta = wrd->sta;
 	u32 w5, w27, addr, val;
-	u16 idx = sta->vif->mt76.omac_idx;
+	u16 idx;
 
 	lockdep_assert_held(&dev->mt76.mutex);
 
@@ -119,6 +119,7 @@ static int mt7663_usb_sdio_set_rates(struct mt7615_dev *dev,
 
 	sta->rate_probe = sta->rateset[rate->rateset].probe_rate.idx != -1;
 
+	idx = sta->vif->mt76.omac_idx;
 	idx = idx > HW_BSSID_MAX ? HW_BSSID_0 : idx;
 	addr = idx > 1 ? MT_LPON_TCR2(idx): MT_LPON_TCR0(idx);
 
-- 
2.30.2


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

WARNING: multiple messages have this Message-ID (diff)
From: Colin King <colin.king@canonical.com>
To: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>,
	Ryder Lee <ryder.lee@mediatek.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH][next] mt76: mt7615: Fix a dereference of pointer sta before it is null checked
Date: Mon, 19 Apr 2021 14:20:32 +0100	[thread overview]
Message-ID: <20210419132032.177788-1-colin.king@canonical.com> (raw)

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

Currently the assignment of idx dereferences pointer sta before
sta is null checked, leading to a potential null pointer dereference.
Fix this by assigning idx when it is required after the null check on
pointer sta.

Addresses-Coverity: ("Dereference before null check")
Fixes: a4a5a430b076 ("mt76: mt7615: fix TSF configuration")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
index 4a370b9f7a17..f8d3673c2cae 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
@@ -67,7 +67,7 @@ static int mt7663_usb_sdio_set_rates(struct mt7615_dev *dev,
 	struct mt7615_rate_desc *rate = &wrd->rate;
 	struct mt7615_sta *sta = wrd->sta;
 	u32 w5, w27, addr, val;
-	u16 idx = sta->vif->mt76.omac_idx;
+	u16 idx;
 
 	lockdep_assert_held(&dev->mt76.mutex);
 
@@ -119,6 +119,7 @@ static int mt7663_usb_sdio_set_rates(struct mt7615_dev *dev,
 
 	sta->rate_probe = sta->rateset[rate->rateset].probe_rate.idx != -1;
 
+	idx = sta->vif->mt76.omac_idx;
 	idx = idx > HW_BSSID_MAX ? HW_BSSID_0 : idx;
 	addr = idx > 1 ? MT_LPON_TCR2(idx): MT_LPON_TCR0(idx);
 
-- 
2.30.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2021-04-19 13:23 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19 13:20 Colin King [this message]
2021-04-19 13:20 ` [PATCH][next] mt76: mt7615: Fix a dereference of pointer sta before it is null checked Colin King
2021-04-19 13:20 ` Colin King

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