From 2d10aa8b612d6975ec57339051e0b2116a2e45e5 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Thu, 3 Aug 2023 04:34:05 +0200
Subject: Prevent a class of crashes in monitoring

---
 fiv-io-model.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fiv-io-model.c b/fiv-io-model.c
index 2f8b192..2ee1002 100644
--- a/fiv-io-model.c
+++ b/fiv-io-model.c
@@ -346,6 +346,8 @@ static void
 monitor_apply(enum monitor_event event, GPtrArray *target, int index,
 	FivIoModelEntry *new_entry)
 {
+	g_return_if_fail(event != MONITOR_CHANGING || index >= 0);
+
 	if (event == MONITOR_RENAMING && index < 0)
 		// The file used to be filtered out but isn't anymore.
 		event = MONITOR_ADDING;
@@ -706,7 +708,7 @@ fiv_io_model_open(FivIoModel *self, GFile *directory, GError **error)
 
 	GError *e = NULL;
 	if ((self->monitor = g_file_monitor_directory(
-			 directory, G_FILE_MONITOR_WATCH_MOVES, NULL, &e))) {
+			directory, G_FILE_MONITOR_WATCH_MOVES, NULL, &e))) {
 		g_signal_connect(self->monitor, "changed",
 			G_CALLBACK(on_monitor_changed), self);
 	} else {
-- 
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