Return-path: Received: from m50-133.163.com ([123.125.50.133]:36765 "EHLO m50-133.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1427705AbdDWHBy (ORCPT ); Sun, 23 Apr 2017 03:01:54 -0400 From: Pan Bian To: Jakub Kicinski , Kalle Valo , Matthias Brugger Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Pan Bian Subject: [PATCH 1/1] mt7601u: check return value of alloc_skb Date: Sun, 23 Apr 2017 15:00:23 +0800 Message-Id: <1492930823-17249-1-git-send-email-bianpan2016@163.com> (sfid-20170423_090219_346441_7830741A) Sender: linux-wireless-owner@vger.kernel.org List-ID: 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 --- 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 dbdfb3f..a9f5f39 100644 --- a/drivers/net/wireless/mediatek/mt7601u/mcu.c +++ b/drivers/net/wireless/mediatek/mt7601u/mcu.c @@ -66,8 +66,10 @@ static inline void trace_mt_mcu_msg_send_cs(struct mt7601u_dev *dev, 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 @@ int mt7601u_mcu_tssi_read_kick(struct mt7601u_dev *dev, int use_hvga) }; skb = mt7601u_mcu_msg_alloc(dev, &msg, sizeof(msg)); + if (!skb) + return -ENOMEM; return mt7601u_mcu_msg_send(dev, skb, CMD_CALIBRATION_OP, true); } -- 1.9.1