diff --git a/[refs] b/[refs]
index 14a663922a63..002d1ef5b018 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b3ca9b02b00704053a38bfe4c31dbbb9c13595d0
+refs/heads/master: ce3c869283739379134e1a90c37dd1a30b5f31b7
diff --git a/trunk/drivers/net/macvtap.c b/trunk/drivers/net/macvtap.c
index 5933621ac3ff..fc27a9926d9e 100644
--- a/trunk/drivers/net/macvtap.c
+++ b/trunk/drivers/net/macvtap.c
@@ -528,8 +528,9 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q,
 		vnet_hdr_len = q->vnet_hdr_sz;
 
 		err = -EINVAL;
-		if ((len -= vnet_hdr_len) < 0)
+		if (len < vnet_hdr_len)
 			goto err;
+		len -= vnet_hdr_len;
 
 		err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0,
 					   sizeof(vnet_hdr));