From 7f387adb6996c8fe93a280b97048d41bfd0daa1f Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 25 Feb 2024 12:30:48 +0200
Subject: [PATCH] ipsec esp: avoid dereferencing freed secasindex

(cherry picked from commit 1a56620b7958cac2b9048589cb730c46958ab539)
---
 sys/netipsec/xform_esp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sys/netipsec/xform_esp.c b/sys/netipsec/xform_esp.c
index 16f7b24375f..7ad6085db87 100644
--- a/sys/netipsec/xform_esp.c
+++ b/sys/netipsec/xform_esp.c
@@ -508,6 +508,13 @@ esp_input_cb(struct cryptop *crp)
 	xd = crp->crp_opaque;
 	CURVNET_SET(xd->vnet);
 	sav = xd->sav;
+	if (sav->state >= SADB_SASTATE_DEAD) {
+		/* saidx is freed */
+		DPRINTF(("%s: dead SA %p spi %#x\n", __func__, sav, sav->spi));
+		ESPSTAT_INC(esps_notdb);
+		error = ESRCH;
+		goto bad;
+	}
 	skip = xd->skip;
 	protoff = xd->protoff;
 	cryptoid = xd->cryptoid;