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-rw-r--r--net/packet/af_packet.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 0856a13cb53..8298e676f5a 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1610,9 +1610,11 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
err = -EINVAL;
vnet_hdr_len = sizeof(vnet_hdr);
- if ((len -= vnet_hdr_len) < 0)
+ if (len < vnet_hdr_len)
goto out_free;
+ len -= vnet_hdr_len;
+
if (skb_is_gso(skb)) {
struct skb_shared_info *sinfo = skb_shinfo(skb);