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net: pkt: Make sure iface is not null when accessing L2

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It is possible that the network interface is not set when we
check the interface in net_pkt.c:pkt_buffer_length(). For example
in icmpv6 unit test the interface is left as NULL as the test does
not care about what network interface is used. For real hw like
mimxrt1050_evk, which supports Ethernet, we need to add additional
checks for the interface being non-null.

Fixes #20088

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This commit is contained in:
Jukka Rissanen 2019-10-29 12:25:30 +02:00 • committed by Maureen Helm
commit 971ae59913
1 changed files with 4 additions and 0 deletions
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4
include/net/net_if.h
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@ -550,6 +550,10 @@ enum net_verdict net_if_send_data(struct net_if *iface, struct net_pkt *pkt);
*/
static inline const struct net_l2 * const net_if_l2(struct net_if *iface)
{
if (!iface) {
return NULL;
}
return iface->if_dev->l2;
}