net: if: ipv6: Do not crash if there are no network interfaces

jukkar · fabiobaltieri · commit 17f852f3cfed · 2024-05-06T22:50:18.000+01:00
When trying to get IPv6 prefix, if there are no network interfaces
then the net_if_get_default() will return NULL but we should not
crash at that point but return gracefully.

Signed-off-by: Jukka Rissanen &lt;jukka.rissanen@nordicsemi.no&gt;
diff --git a/subsys/net/ip/net_if.c b/subsys/net/ip/net_if.c
@@ -2536,6 +2536,10 @@ struct net_if_ipv6_prefix *net_if_ipv6_prefix_get(struct net_if *iface,
 		iface = net_if_get_default();
 	}
 
+	if (!iface) {
+		return NULL;
+	}
+
 	net_if_lock(iface);
 
 	ipv6 = iface->config.ip.ipv6;

Original file line number	Diff line number	Diff line change
`@@ -2536,6 +2536,10 @@ struct net_if_ipv6_prefix net_if_ipv6_prefix_get(struct net_if iface,`
`2536`	`2536`	`iface = net_if_get_default();`
`2537`	`2537`	`}`
`2538`	`2538`
	`2539`	`+ if (!iface) {`
	`2540`	`+ return NULL;`
	`2541`	`+ }`
	`2542`	`+`
`2539`	`2543`	`net_if_lock(iface);`
`2540`	`2544`
`2541`	`2545`	`ipv6 = iface->config.ip.ipv6;`