From 70fdf906e5ad4fb48bd363275d72ec9fa1c020c1 Mon Sep 17 00:00:00 2001
From: Rob Connolly <robert.connolly@datamars.com>
Date: Wed, 2 Dec 2020 13:18:31 +1300
Subject: [PATCH] slip: Fix SLIP RX linked list append.

Append to the linked list of pbuf objects was broken so that the second
(and subsequent) packets received in a SLIP transaction would be
appended to themselves and consequently lost.
This resulted in these packets being dropped and the system suffering
extreme memory leakage.

Picked from espressif/esp-lwip@01d0ecff
Ref IDF-4847
---
 src/netif/slipif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/netif/slipif.c b/src/netif/slipif.c
index 9b175dc3..773f1103 100644
--- a/src/netif/slipif.c
+++ b/src/netif/slipif.c
@@ -497,7 +497,7 @@ slipif_rxbyte_enqueue(struct netif *netif, u8_t data)
     if (priv->rxpackets != NULL) {
 #if SLIP_RX_QUEUE
       /* queue multiple pbufs */
-      struct pbuf *q = p;
+      struct pbuf *q = priv->rxpackets;
       while (q->next != NULL) {
         q = q->next;
       }