Automated rollback of changelist 307477185

PiperOrigin-RevId: 307598974

1 files changed, 2 insertions, 10 deletions

diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index 17202cc7a..104aafbed 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -328,11 +328,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
 func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt stack.PacketBuffer) *tcpip.Error {
 	// The packet already has an IP header, but there are a few required
 	// checks.
-	h, ok := pkt.Data.PullUp(header.IPv4MinimumSize)
-	if !ok {
-		return tcpip.ErrInvalidOptionValue
-	}
-	ip := header.IPv4(h)
+	ip := header.IPv4(pkt.Data.First())
 	if !ip.IsValid(pkt.Data.Size()) {
 		return tcpip.ErrInvalidOptionValue
 	}
@@ -382,11 +378,7 @@ func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt stack.PacketBuf
 // HandlePacket is called by the link layer when new ipv4 packets arrive for
 // this endpoint.
 func (e *endpoint) HandlePacket(r *stack.Route, pkt stack.PacketBuffer) {
-	headerView, ok := pkt.Data.PullUp(header.IPv4MinimumSize)
-	if !ok {
-		r.Stats().IP.MalformedPacketsReceived.Increment()
-		return
-	}
+	headerView := pkt.Data.First()
 	h := header.IPv4(headerView)
 	if !h.IsValid(pkt.Data.Size()) {
 		r.Stats().IP.MalformedPacketsReceived.Increment()