https://bugs.gentoo.org/893776
https://bugs.busybox.net/show_bug.cgi?id=15326
http://lists.busybox.net/pipermail/busybox/2023-February/090173.html

From 2d4a3d9e6c1493a9520b907e07a41aca90cdfd94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Arsen=20Arsenovi=C4=87?= <arsen@gentoo.org>
Date: Tue, 21 Feb 2023 20:20:31 +0100
Subject: fixdep: avoid underflow when end of entry doesn't coincide with EOF
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Bug: https://bugs.gentoo.org/893776
Closes: https://bugs.busybox.net/show_bug.cgi?id=15326
Signed-off-by: Arsen Arsenović <arsen@gentoo.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -338,6 +338,11 @@ void parse_dep_file(void *map, size_t len)
 			do p--; while (!isalnum((unsigned char)*p));
 			p++;
 		}
+		if (p < m) {
+			/* we've consumed the last filename of this list
+			   already.  */
+			break;
+		}
 		memcpy(s, m, p-m); s[p-m] = 0;
 		if (strrcmp(s, "include/autoconf.h") &&
 		    strrcmp(s, "arch/um/include/uml-config.h") &&
-- 
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