From 409183d95d5820e08d8bc68d2b0921ccf9f2392e Mon Sep 17 00:00:00 2001
From: Oleg Hahm <oleg@hobbykeller.org>
Date: Mon, 20 Mar 2017 11:44:20 +0100
Subject: [PATCH] pkg: lwip: do not panic on failing netdev->recv()

---
 pkg/lwip/contrib/netdev/lwip_netdev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/lwip/contrib/netdev/lwip_netdev.c b/pkg/lwip/contrib/netdev/lwip_netdev.c
index d961777127..ffc8638441 100644
--- a/pkg/lwip/contrib/netdev/lwip_netdev.c
+++ b/pkg/lwip/contrib/netdev/lwip_netdev.c
@@ -215,6 +215,10 @@ static struct pbuf *_get_recv_pkt(netdev_t *dev)
 {
     int len = dev->driver->recv(dev, _tmp_buf, sizeof(_tmp_buf), NULL);
 
+    if (len < 0) {
+        DEBUG("lwip_netdev: an error occurred while reading the packet\n");
+        return NULL;
+    }
     assert(((unsigned)len) <= UINT16_MAX);
     struct pbuf *p = pbuf_alloc(PBUF_RAW, (u16_t)len, PBUF_POOL);