From 9b2f2fbfcbc51f77e96a41e62b1c06a8ccd4ca15 Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Wed, 23 Oct 2024 16:55:16 +0000
Subject: [PATCH] devmatch: Catch truncated linker hints files

PR:		282268
Reviewed by:	christos, imp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D47243
---
 sbin/devmatch/devmatch.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sbin/devmatch/devmatch.c b/sbin/devmatch/devmatch.c
index 49f9be00a2e7..4a5a300ca313 100644
--- a/sbin/devmatch/devmatch.c
+++ b/sbin/devmatch/devmatch.c
@@ -127,6 +127,12 @@ read_linker_hints(void)
 			err(1, "Can't open %s for reading", fn);
 	}
 
+	if (len < sizeof(int)) {
+		warnx("Linker hints file too short.");
+		free(hints);
+		hints = NULL;
+		return;
+	}
 	if (*(int *)(intptr_t)hints != LINKER_HINTS_VERSION) {
 		warnx("Linker hints version %d doesn't match expected %d.",
 		    *(int *)(intptr_t)hints, LINKER_HINTS_VERSION);