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isakmpd: Fix NULL dereference in message_validate_sa()

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When the responder cookie is non-zero but sa_lookup_by_header()
finds no matching SA, msg->isakmp_sa is NULL.  Thus check before
dereferencing.
This commit is contained in:
hshoexer
2026-06-16 11:50:53 +00:00
parent 50d94f9ab6
commit 2f229140c8
1 changed files with 3 additions and 2 deletions
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sbin/isakmpd/message.c
+3 -2
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@@ -1,4 +1,4 @@
/* $OpenBSD: message.c,v 1.133 2026/06/11 09:55:17 hshoexer Exp $ */
/* $OpenBSD: message.c,v 1.134 2026/06/16 11:50:53 hshoexer Exp $ */
/* $EOM: message.c,v 1.156 2000/10/10 12:36:39 provos Exp $ */
/*
@@ -1053,7 +1053,8 @@ message_validate_sa(struct message *msg, struct payload *p)
if (zero_test(pkt + ISAKMP_HDR_RCOOKIE_OFF,
ISAKMP_HDR_RCOOKIE_LEN))
exchange = exchange_setup_p1(msg, doi_id);
else if (msg->isakmp_sa->flags & SA_FLAG_READY)
else if (msg->isakmp_sa &&
(msg->isakmp_sa->flags & SA_FLAG_READY))
exchange = exchange_setup_p2(msg, doi_id);
else {
/* XXX What to do here? */