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From 62e803b36173fd096d7ad460dd1d1db9be542593 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 1 Jun 2022 07:38:21 -0600
Subject: [PATCH] [sbix] Limit glyph extents
Fixes https://github.com/harfbuzz/harfbuzz/issues/3557
---
src/hb-ot-color-sbix-table.hh | 6 ++++++
test/fuzzing/fonts/sbix-extents.ttf | Bin 0 -> 582 bytes
2 files changed, 6 insertions(+)
create mode 100644 test/fuzzing/fonts/sbix-extents.ttf
diff --git a/src/hb-ot-color-sbix-table.hh b/src/hb-ot-color-sbix-table.hh
index 9741ebd450..6efae43cda 100644
--- a/src/hb-ot-color-sbix-table.hh
+++ b/src/hb-ot-color-sbix-table.hh
@@ -298,6 +298,12 @@ struct sbix
const PNGHeader &png = *blob->as<PNGHeader>();
+ if (png.IHDR.height >= 65536 || png.IHDR.width >= 65536)
+ {
+ hb_blob_destroy (blob);
+ return false;
+ }
+
extents->x_bearing = x_offset;
extents->y_bearing = png.IHDR.height + y_offset;
extents->width = png.IHDR.width;
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