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29 lines
1.1 KiB
29 lines
1.1 KiB
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 |
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From: Daniel Axtens <dja@axtens.net> |
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Date: Tue, 6 Jul 2021 14:13:40 +1000 |
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Subject: [PATCH] video/readers/png: Refuse to handle multiple image headers |
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This causes the bitmap to be leaked. Do not permit multiple image headers. |
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Signed-off-by: Daniel Axtens <dja@axtens.net> |
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> |
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(cherry picked from commit 8ce433557adeadbc46429aabb9f850b02ad2bdfb) |
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(cherry picked from commit 6e10bba6a4cbfd6c7bf116f41fd4e037465e19d8) |
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--- |
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grub-core/video/readers/png.c | 3 +++ |
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1 file changed, 3 insertions(+) |
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diff --git a/grub-core/video/readers/png.c b/grub-core/video/readers/png.c |
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index e2a6b1cf3c..8955b8ecfd 100644 |
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--- a/grub-core/video/readers/png.c |
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+++ b/grub-core/video/readers/png.c |
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@@ -258,6 +258,9 @@ grub_png_decode_image_header (struct grub_png_data *data) |
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int color_bits; |
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enum grub_video_blit_format blt; |
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+ if (data->image_width || data->image_height) |
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+ return grub_error (GRUB_ERR_BAD_FILE_TYPE, "png: two image headers found"); |
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+ |
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data->image_width = grub_png_get_dword (data); |
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data->image_height = grub_png_get_dword (data); |
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