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From: Ryder Lee <ryder.lee@mediatek.com>
To: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Cc: Shayne Chen <shayne.chen@mediatek.com>,
	<linux-wireless@vger.kernel.org>,
	<linux-mediatek@lists.infradead.org>,
	Ryder Lee <ryder.lee@mediatek.com>
Subject: [PATCH] mt76: mt7915: drop zero-length packet to avoid Tx hang
Date: Tue, 29 Dec 2020 12:15:30 +0800	[thread overview]
Message-ID: <fe085320ea30e6b00c6bed0dab28823580e94978.1609215115.git.ryder.lee@mediatek.com> (raw)

Hardware wouldn't add LLC-SNAP when skb->data_len is 0, which causes
Tx hang, so add a check to drop this kind of packet.

Tested-by: Bo Jiao <bo.jiao@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index f504eeb221f9..a2d63b7a346a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -942,6 +942,9 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	int id, i, nbuf = tx_info->nbuf - 1;
 	u8 *txwi = (u8 *)txwi_ptr;
 
+	if (unlikely(tx_info->skb->len <= ETH_HLEN))
+		return -EINVAL;
+
 	if (!wcid)
 		wcid = &dev->mt76.global_wcid;
 
-- 
2.18.0


WARNING: multiple messages have this Message-ID (diff)
From: Ryder Lee <ryder.lee@mediatek.com>
To: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Cc: linux-mediatek@lists.infradead.org,
	Ryder Lee <ryder.lee@mediatek.com>,
	linux-wireless@vger.kernel.org,
	Shayne Chen <shayne.chen@mediatek.com>
Subject: [PATCH] mt76: mt7915: drop zero-length packet to avoid Tx hang
Date: Tue, 29 Dec 2020 12:15:30 +0800	[thread overview]
Message-ID: <fe085320ea30e6b00c6bed0dab28823580e94978.1609215115.git.ryder.lee@mediatek.com> (raw)

Hardware wouldn't add LLC-SNAP when skb->data_len is 0, which causes
Tx hang, so add a check to drop this kind of packet.

Tested-by: Bo Jiao <bo.jiao@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index f504eeb221f9..a2d63b7a346a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -942,6 +942,9 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	int id, i, nbuf = tx_info->nbuf - 1;
 	u8 *txwi = (u8 *)txwi_ptr;
 
+	if (unlikely(tx_info->skb->len <= ETH_HLEN))
+		return -EINVAL;
+
 	if (!wcid)
 		wcid = &dev->mt76.global_wcid;
 
-- 
2.18.0
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             reply	other threads:[~2020-12-29  4:21 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-29  4:15 Ryder Lee [this message]
2020-12-29  4:15 ` [PATCH] mt76: mt7915: drop zero-length packet to avoid Tx hang Ryder Lee

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