From 18f322c5327fa2a4682d2ba7cd3c2215dbc5372c Mon Sep 17 00:00:00 2001
From: Yorhel <git@yorhel.nl>
Date: Thu, 8 Aug 2024 15:38:54 +0200
Subject: [PATCH] Throw an error when running out of DevId numbers

I find it hard to imagine that this will happen on a real filesystem,
but it can be triggered by a malicious export file. Better protect
against that than invoke undefined behavior.
---
 src/model.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/model.zig b/src/model.zig
index 6dd119f..9ab7cd0 100644
--- a/src/model.zig
+++ b/src/model.zig
@@ -346,6 +346,7 @@ pub const devices = struct {
         defer lock.unlock();
         const d = lookup.getOrPut(dev) catch unreachable;
         if (!d.found_existing) {
+            if (list.items.len >= std.math.maxInt(DevId)) ui.die("Maximum number of device identifiers exceeded.\n", .{});
             d.value_ptr.* = @as(DevId, @intCast(list.items.len));
             list.append(dev) catch unreachable;
         }