From 90130e165d08329d8f2d1753b7981bf50929aee6 Mon Sep 17 00:00:00 2001
From: Jon Lamb <lamb.jon.io@gmail.com>
Date: Mon, 16 Oct 2023 11:10:18 -0700
Subject: [PATCH] Ensure rx buffer slice length matches recvd len

---
 firmware/src/net/eth.rs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/firmware/src/net/eth.rs b/firmware/src/net/eth.rs
index eafe6c5..36f04d0 100644
--- a/firmware/src/net/eth.rs
+++ b/firmware/src/net/eth.rs
@@ -63,10 +63,11 @@ impl<'buf> Device for Eth<'buf> {
 
         match self.drv.next_packet() {
             Ok(Some(packet)) => {
-                if packet.len() as usize > self.rx_buffer.len() {
+                let pkt_len = packet.len() as usize;
+                if pkt_len > self.rx_buffer.len() {
                     warn!(
                         "Dropping rx packet, too big, len {}, cap {}",
-                        packet.len(),
+                        pkt_len,
                         self.rx_buffer.len()
                     );
                     packet.ignore().unwrap();
@@ -76,7 +77,7 @@ impl<'buf> Device for Eth<'buf> {
                     None
                 } else {
                     Some((
-                        RxToken(&mut self.rx_buffer[..]),
+                        RxToken(&mut self.rx_buffer[..pkt_len]),
                         TxToken {
                             phy: &mut self.drv,
                             buf: self.tx_buffer,