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From:   zhong jiang <zhongjiang@huawei.com>
To:     <davem@davemloft.net>
CC:     <kuznet@ms2.inr.ac.ru>, <yoshfuji@linux-ipv6.org>,
        <santosh@chelsio.com>, <netdev@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/6] net: tap: remove redundant null pointer check before kfree_skb
Date:   Thu, 20 Sep 2018 17:37:41 +0800
Message-ID: <1537436266-41955-2-git-send-email-zhongjiang@huawei.com>
In-Reply-To: <1537436266-41955-1-git-send-email-zhongjiang@huawei.com>
References: <1537436266-41955-1-git-send-email-zhongjiang@huawei.com>
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Sender: linux-kernel-owner@vger.kernel.org
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kfree_skb has taken the null pointer into account. hence it is safe
to remove the redundant null pointer check before kfree_skb.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 drivers/net/tap.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index a4ab4a7..f03004f 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -830,8 +830,7 @@ static ssize_t tap_do_read(struct tap_queue *q,
 	ssize_t ret = 0;
 
 	if (!iov_iter_count(to)) {
-		if (skb)
-			kfree_skb(skb);
+		kfree_skb(skb);
 		return 0;
 	}
 
@@ -1236,8 +1235,7 @@ static int tap_recvmsg(struct socket *sock, struct msghdr *m,
 	struct sk_buff *skb = m->msg_control;
 	int ret;
 	if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) {
-		if (skb)
-			kfree_skb(skb);
+		kfree_skb(skb);
 		return -EINVAL;
 	}
 	ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT, skb);
-- 
1.7.12.4