[PATCH AUTOSEL for 4.4 052/101] mt7601u: check return value of alloc_skb

Sasha Levin
2018-03-08T05:33:45Z

From: Pan Bian <bianpan2016@163.com>

[ Upstream commit 5fb01e91daf84ad1e50edfcf63116ecbe31e7ba7 ]

Function alloc_skb() will return a NULL pointer if there is no enough
memory. However, in function mt7601u_mcu_msg_alloc(), its return value
is not validated before it is used. This patch fixes it.

Signed-off-by: Pan Bian <bianpan2016@163.com>
Acked-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/net/wireless/mediatek/mt7601u/mcu.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt7601u/mcu.c b/drivers/net/wireless/mediatek/mt7601u/mcu.c
index fbb1986eda3c..686b1b5dd394 100644
--- a/drivers/net/wireless/mediatek/mt7601u/mcu.c
+++ b/drivers/net/wireless/mediatek/mt7601u/mcu.c
@@ -66,8 +66,10 @@ mt7601u_mcu_msg_alloc(struct mt7601u_dev *dev, const void *data, int len)
WARN_ON(len % 4); /* if length is not divisible by 4 we need to pad */

skb = alloc_skb(len + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
- skb_reserve(skb, MT_DMA_HDR_LEN);
- memcpy(skb_put(skb, len), data, len);
+ if (skb) {
+ skb_reserve(skb, MT_DMA_HDR_LEN);
+ memcpy(skb_put(skb, len), data, len);
+ }

return skb;
}
@@ -170,6 +172,8 @@ static int mt7601u_mcu_function_select(struct mt7601u_dev *dev,
};

skb = mt7601u_mcu_msg_alloc(dev, &msg, sizeof(msg));
+ if (!skb)
+ return -ENOMEM;
return mt7601u_mcu_msg_send(dev, skb, CMD_FUN_SET_OP, func == 5);
}

@@ -205,6 +209,8 @@ mt7601u_mcu_calibrate(struct mt7601u_dev *dev, enum mcu_calibrate cal, u32 val)
};

skb = mt7601u_mcu_msg_alloc(dev, &msg, sizeof(msg));
+ if (!skb)
+ return -ENOMEM;
return mt7601u_mcu_msg_send(dev, skb, CMD_CALIBRATION_OP, true);
}

--
2.14.1