From: zhong jiang <zhongjiang@huawei.com>
Date: Thu, 20 Sep 2018 17:46:12 +0800
Subject: bpf: remove redundant null pointer check before consume_skb
Patch-mainline: v4.20-rc1
Git-commit: 788758d1fe874fd20ecb0ab490552d94c024a9de
References: bsc#1109837

consume_skb has taken the null pointer into account. hence it is safe
to remove the redundant null pointer check before consume_skb.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 kernel/bpf/sockmap.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/kernel/bpf/sockmap.c
+++ b/kernel/bpf/sockmap.c
@@ -612,8 +612,7 @@ static int free_sg(struct sock *sk, int
 		if (i == MAX_SKB_FRAGS)
 			i = 0;
 	}
-	if (md->skb)
-		consume_skb(md->skb);
+	consume_skb(md->skb);
 
 	return free;
 }
@@ -995,8 +994,7 @@ bytes_ready:
 
 		if (!sg->length && md->sg_start == md->sg_end) {
 			list_del(&md->list);
-			if (md->skb)
-				consume_skb(md->skb);
+			consume_skb(md->skb);
 			kfree(md);
 		}
 	}