From a5a9d2d8dfe2f192af9cb17dae16142c7b7eda8d Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Fri, 17 Apr 2026 14:31:31 +1000
Subject: [PATCH] tools: guard against zero-length os-release files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1467>
---
 tools/libinput-record.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/libinput-record.c b/tools/libinput-record.c
index f3e2c0e8..1cff07e8 100644
--- a/tools/libinput-record.c
+++ b/tools/libinput-record.c
@@ -1379,7 +1379,9 @@ print_system_header(FILE *fp)
 		char osrstr[256] = "unknown";
 
 		while (fgets(osrstr, sizeof(osrstr), osrelease)) {
-			osrstr[strlen(osrstr) - 1] = '\0'; /* linebreak */
+			size_t len = strlen(osrstr);
+			if (len > 0 && osrstr[len - 1] == '\n')
+				osrstr[len - 1] = '\0'; /* linebreak */
 
 			if (!distro && strstartswith(osrstr, "ID="))
 				distro = strstrip(&osrstr[3], "\"'");