[PATCH 4/4] lwip: treat zero/invalid IPv4 addresses as unset in init_ifs

From: Joan Lledó <[email protected]>

    When the caller passes INADDR_ANY or INADDR_NONE as the address, reset
    netmask, peer and gateway to INADDR_NONE too, so the configuration passes
    ipv4config_is_valid() validation instead of being silently dropped.
---
 lwip/lwip-util.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lwip/lwip-util.c b/lwip/lwip-util.c
index 988e3675..f6f0a631 100644
--- a/lwip/lwip-util.c
+++ b/lwip/lwip-util.c
@@ -169,6 +169,18 @@ init_ifs (void *arg)
       if (!in->dev_name[0])
 	continue;
 
+      /*
+       * The caller is trying to set an invalid address,
+       * set all fields to empty so it passes the validation
+       */
+      if (in->address.addr == INADDR_ANY || in->address.addr == INADDR_NONE)
+	{
+	  in->address.addr = INADDR_NONE;
+	  in->netmask.addr = INADDR_NONE;
+	  in->peer.addr = INADDR_NONE;
+	  in->gateway.addr = INADDR_NONE;
+	}
+
       if (!ipv4config_is_valid (in->address.addr, in->netmask.addr,
 				in->gateway.addr, INADDR_NONE))
 	continue;
-- 
2.50.1