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[interface] Ignore any attempts to plug in the null interface 

Allow intf_plug() and intf_plug_plug() to be called safely on
interfaces that may be the null interface.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/181/head
Michael Brown 2020-12-07 13:48:35 +00:00
parent b6e2ea03b0
commit cb0ba2f825
1 changed files with 5 additions and 0 deletions
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5
src/core/interface.c
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@ -81,9 +81,14 @@ struct interface null_intf = INTF_INIT ( null_intf_desc );
* interface is updated to point to the new destination interface.
*/
void intf_plug ( struct interface *intf, struct interface *dest ) {
if ( intf == &null_intf )
return;
DBGC ( INTF_COL ( intf ),
"INTF " INTF_INTF_FMT " replug to " INTF_FMT "\n",
INTF_INTF_DBG ( intf, intf->dest ), INTF_DBG ( dest ) );
intf_get ( dest );
intf_put ( intf->dest );
intf->dest = dest;