mt7601u: check return value of alloc_skb

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>

diff --git a/drivers/net/wireless/mediatek/mt7601u/mcu.c b/drivers/net/wireless/mediatek/mt7601u/mcu.c
index dbdfb3f..a9f5f39 100644 (file)
--- 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);
 }