# HG changeset patch
# User Roy Marples <roy@marples.name>
# Date 1601323821 -3600
# Node ID 23f35ea1a34a681f224f72bb285d6f463b02f7f5
# Parent  8e2b8ce8c9724ac5a4904ea7ac001532599cab2f
privsep: fix crash when interface departs before bpf returns for it

diff -r 8e2b8ce8c972 -r 23f35ea1a34a src/dhcp.c
--- a/src/dhcp.c	Mon Sep 28 17:09:38 2020 +0100
+++ b/src/dhcp.c	Mon Sep 28 21:10:21 2020 +0100
@@ -3477,6 +3477,9 @@
 #ifdef PRIVSEP
 	const struct dhcp_state *state = D_CSTATE(ifp);
 
+	if (state == NULL)
+		return;
+
 	/* Ignore double reads */
 	if (IN_PRIVSEP(ifp->ctx)) {
 		switch (state->state) {
diff -r 8e2b8ce8c972 -r 23f35ea1a34a src/privsep-bpf.c
--- a/src/privsep-bpf.c	Mon Sep 28 17:09:38 2020 +0100
+++ b/src/privsep-bpf.c	Mon Sep 28 21:10:21 2020 +0100
@@ -266,6 +266,10 @@
 	size_t bpf_len;
 
 	ifp = if_findindex(ctx->ifaces, psm->ps_id.psi_ifindex);
+	/* interface may have departed .... */
+	if (ifp == NULL)
+		return -1;
+
 	bpf = iov->iov_base;
 	bpf_len = iov->iov_len;