From aa04f67b1cbb2cd779f46229aa499b1804e572ff Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Tue, 14 Apr 2026 07:23:11 +1000
Subject: [PATCH] plugin: guard against unsigned underflow in plugin_has_mask

nevents should never be zero but let's prevent against an underflow, if
only to make the analyzers happy.

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1465>
---
 src/libinput-plugin.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libinput-plugin.c b/src/libinput-plugin.c
index 788b42f2..766e85d0 100644
--- a/src/libinput-plugin.c
+++ b/src/libinput-plugin.c
@@ -726,6 +726,9 @@ plugin_has_mask(struct libinput_plugin *plugin, struct evdev_frame *frame)
 	size_t nevents;
 	struct evdev_event *events = evdev_frame_get_events(frame, &nevents);
 
+	if (nevents == 0)
+		return false;
+
 	/* nevents - 1 because we don't check the SYN_REPORT */
 	for (size_t i = 0; i < nevents - 1; i++) {
 		struct evdev_event *e = &events[i];