From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Daniel Axtens 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 Reviewed-by: Daniel Kiper (cherry picked from commit 8ce433557adeadbc46429aabb9f850b02ad2bdfb) (cherry picked from commit 6e10bba6a4cbfd6c7bf116f41fd4e037465e19d8) (cherry picked from commit 812272d919ecfd368c008f15b677d369616ada54) --- 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);