From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Daniel Axtens <dja@axtens.net>

Date: Tue, 6 Jul 2021 14:13:40 +1000

Subject: [PATCH] video/readers/png: Refuse to handle multiple image headers

This causes the bitmap to be leaked. Do not permit multiple image headers.

Signed-off-by: Daniel Axtens <dja@axtens.net>

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

(cherry picked from commit 8ce433557adeadbc46429aabb9f850b02ad2bdfb)

---

 grub-core/video/readers/png.c | 3 +++

 1 file changed, 3 insertions(+)

diff --git a/grub-core/video/readers/png.c b/grub-core/video/readers/png.c

index e2a6b1cf3c..8955b8ecfd 100644

--- a/grub-core/video/readers/png.c

+++ b/grub-core/video/readers/png.c

@@ -258,6 +258,9 @@ grub_png_decode_image_header (struct grub_png_data *data)

   int color_bits;

   enum grub_video_blit_format blt;

+  if (data->image_width || data->image_height)

+    return grub_error (GRUB_ERR_BAD_FILE_TYPE, "png: two image headers found");

+

   data->image_width = grub_png_get_dword (data);

   data->image_height = grub_png_get_dword (data);