[PATCH] ip_gre: fix wrong return value of erspan_rcv

[Haishuang Yan]

If pskb_may_pull return failed, return PACKET_REJECT instead of -ENOMEM.

Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Cc: William Tu <u9012...@gmail.com>
Signed-off-by: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>
---
 net/ipv4/ip_gre.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 61ee014..d747d06 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -267,7 +267,7 @@ static int erspan_rcv(struct sk_buff *skb, struct 
tnl_ptk_info *tpi,
        len = gre_hdr_len + sizeof(*ershdr);
 
        if (unlikely(!pskb_may_pull(skb, len)))
-               return -ENOMEM;
+               return PACKET_REJECT;
 
        iph = ip_hdr(skb);
        ershdr = (struct erspanhdr *)(skb->data + gre_hdr_len);
-- 
1.8.3.1