[src-draft/trunk]: src/sys/net Dont destroy a null pfil head.

[Nathanial Sloss <nat%netbsd.org@localhost>]

details:   https://anonhg.NetBSD.org/src-all/rev/9c7336cd9a0c
branches:  trunk
changeset: 370231:9c7336cd9a0c
user:      Nathanial Sloss <nat%netbsd.org@localhost>
date:      Mon May 11 09:34:06 2020 +1000

description:
Dont destroy a null pfil head.

diffstat:

 sys/net/pfil.c |  3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diffs (13 lines):

diff -r 8a23331b58d4 -r 9c7336cd9a0c sys/net/pfil.c
--- a/sys/net/pfil.c    Mon May 11 09:32:30 2020 +1000
+++ b/sys/net/pfil.c    Mon May 11 09:34:06 2020 +1000
@@ -138,6 +138,9 @@
 void
 pfil_head_destroy(pfil_head_t *pfh)
 {
+       if (pfh == NULL)
+               return;
+
        LIST_REMOVE(pfh, ph_list);
 
        psref_target_destroy(&pfh->ph_in.active->psref, pfil_psref_class);