From 52cabca4e549e1e8304f6caf8022d2435b9185d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kacper=20Michaj=C5=82ow?= <kasper93@gmail.com>
Date: Sun, 21 Jan 2024 18:27:04 +0100
Subject: [PATCH] osdep/io: expand path before LoadLibrary

Fixes compatibility with loading scripts from relative config paths.

Fixes #13212
---
 osdep/io.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/osdep/io.c b/osdep/io.c
index bba9ddc1dd..93f97b5ecf 100644
--- a/osdep/io.c
+++ b/osdep/io.c
@@ -738,9 +738,23 @@ static void mp_dl_init(void)
 
 void *mp_dlopen(const char *filename, int flag)
 {
-    wchar_t *wfilename = mp_from_utf8(NULL, filename);
-    HMODULE lib = LoadLibraryW(wfilename);
-    talloc_free(wfilename);
+    HMODULE lib = NULL;
+    void *ta_ctx = talloc_new(NULL);
+    wchar_t *wfilename = mp_from_utf8(ta_ctx, filename);
+
+    DWORD len = GetFullPathNameW(wfilename, 0, NULL, NULL);
+    if (!len)
+        goto err;
+
+    wchar_t *path = talloc_array(ta_ctx, wchar_t, len);
+    len = GetFullPathNameW(wfilename, len, path, NULL);
+    if (!len)
+        goto err;
+
+    lib = LoadLibraryW(path);
+
+err:
+    talloc_free(ta_ctx);
     mp_dl_result.errcode = GetLastError();
     return (void *)lib;
 }