From 8ea847e563292da39a5589eb6aaaf877dda81e67 Mon Sep 17 00:00:00 2001
From: StaticSaga <61866965+StaticSaga@users.noreply.github.com>
Date: Sat, 10 Jul 2021 13:59:58 +0200
Subject: [PATCH] bmp: Sanity check images

---
 stage23/lib/bmp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/stage23/lib/bmp.c b/stage23/lib/bmp.c
index a299caac..1b381c56 100644
--- a/stage23/lib/bmp.c
+++ b/stage23/lib/bmp.c
@@ -40,7 +40,10 @@ int bmp_open_image(struct image *image, struct file_handle *file) {
     if (memcmp(&header.bf_signature, "BM", 2) != 0)
         return -1;
 
-    if ((header.bi_bpp < 8) | ((header.bi_bpp % 8) != 0))
+    if ((header.bi_bpp != 32) && (header.bi_bpp != 24))
+        return -1;
+
+    if (header.bi_compression)
         return -1;
 
     struct bmp_local *local = ext_mem_alloc(sizeof(struct bmp_local));