From 32e77bcdec5c034a9252876aa018f0bf34b36dbc Mon Sep 17 00:00:00 2001
From: Olivier Certner <olce@FreeBSD.org>
Date: Mon, 28 Oct 2024 17:59:57 +0100
Subject: [PATCH] vm_phys_early_startup(): Panic if phys_avail[] is empty

Reviewed by:    markj
MFC after:      1 week
Sponsored by:   The FreeBSD Foundation
Differential Revision:  https://reviews.freebsd.org/D48631
---
 sys/vm/vm_phys.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c
index 82272be1a6c..ca6bec8b8b9 100644
--- a/sys/vm/vm_phys.c
+++ b/sys/vm/vm_phys.c
@@ -2017,6 +2017,9 @@ vm_phys_early_startup(void)
 	struct vm_phys_seg *seg;
 	int i;
 
+	if (phys_avail[1] == 0)
+		panic("phys_avail[] is empty");
+
 	for (i = 0; phys_avail[i + 1] != 0; i += 2) {
 		phys_avail[i] = round_page(phys_avail[i]);
 		phys_avail[i + 1] = trunc_page(phys_avail[i + 1]);