Test bitmap size earlier for PNGs

Fix memory leak in pngshim.c
Resolves: #1890211

freetype-2.10.0-png-bitmap-size.patch

@@ -0,0 +1,48 @@
+From a3bab162b2ae616074c8877a04556932998aeacd Mon Sep 17 00:00:00 2001
+From: Werner Lemberg <wl@gnu.org>
+Date: Mon, 19 Oct 2020 23:45:28 +0200
+Subject: [PATCH] [sfnt] Fix heap buffer overflow (#59308).
+
+This is CVE-2020-15999.
+
+* src/sfnt/pngshim.c (Load_SBit_Png): Test bitmap size earlier.
+---
+ ChangeLog          |  8 ++++++++
+ src/sfnt/pngshim.c | 14 +++++++-------
+ 2 files changed, 15 insertions(+), 7 deletions(-)
+
+diff --git a/src/sfnt/pngshim.c b/src/sfnt/pngshim.c
+index 2e64e5846..f55016122 100644
+--- a/src/sfnt/pngshim.c
++++ b/src/sfnt/pngshim.c
+@@ -332,6 +332,13 @@
+ 
+     if ( populate_map_and_metrics )
+     {
++      /* reject too large bitmaps similarly to the rasterizer */
++      if ( imgHeight > 0x7FFF || imgWidth > 0x7FFF )
++      {
++        error = FT_THROW( Array_Too_Large );
++        goto DestroyExit;
++      }
++
+       metrics->width  = (FT_UShort)imgWidth;
+       metrics->height = (FT_UShort)imgHeight;
+ 
+@@ -340,13 +347,6 @@
+       map->pixel_mode = FT_PIXEL_MODE_BGRA;
+       map->pitch      = (int)( map->width * 4 );
+       map->num_grays  = 256;
+-
+-      /* reject too large bitmaps similarly to the rasterizer */
+-      if ( map->rows > 0x7FFF || map->width > 0x7FFF )
+-      {
+-        error = FT_THROW( Array_Too_Large );
+-        goto DestroyExit;
+-      }
+     }
+ 
+     /* convert palette/gray image to rgb */
+-- 
+2.26.2
+

freetype-2.10.0-png-memory-leak.patch

@@ -0,0 +1,28 @@
+From 007c109b4594c5e63948bd08b4d5011ad76ffb10 Mon Sep 17 00:00:00 2001
+From: Ben Wagner <bungeman@google.com>
+Date: Fri, 23 Oct 2020 08:29:14 +0200
+Subject: [PATCH] * src/sfnt/pngshim.c (Load_SBit_Png): Fix memory leak
+ (#59322).
+
+The issue is that `rows` is allocated but will not be freed in the
+event that the call to `png_read_image` fails and calls `longjmp`.
+---
+ ChangeLog          | 7 +++++++
+ src/sfnt/pngshim.c | 1 +
+ 2 files changed, 8 insertions(+)
+
+diff --git a/src/sfnt/pngshim.c b/src/sfnt/pngshim.c
+index f55016122..d4e43a9f4 100644
+--- a/src/sfnt/pngshim.c
++++ b/src/sfnt/pngshim.c
+@@ -443,6 +443,7 @@
+     png_read_end( png, info );
+ 
+   DestroyExit:
++    FT_FREE( rows );
+     png_destroy_read_struct( &png, &info, NULL );
+     FT_Stream_Close( &stream );
+ 
+-- 
+2.26.2
+

freetype.spec

@@ -3,7 +3,7 @@
 Summary: A free and portable font rendering engine
 Name: freetype
 Version: 2.10.0
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: (FTL or GPLv2+) and BSD and MIT and Public Domain and zlib with acknowledgement
 URL: http://www.freetype.org
 Source:  http://download.savannah.gnu.org/releases/freetype/freetype-%{version}.tar.bz2
@@ -28,6 +28,10 @@ Patch5:  freetype-2.10.0-internal-outline.patch
 # https://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=c149f7397e484c97f45fb75fa1c7fdda2fc646cd
 Patch6:  0001-pcf-Fix-handling-of-undefined-glyph-56067.patch
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=1890210
+Patch7:  freetype-2.10.0-png-bitmap-size.patch
+Patch8:  freetype-2.10.0-png-memory-leak.patch
+
 BuildRequires:  gcc
 BuildRequires: libX11-devel
 BuildRequires: libpng-devel
@@ -87,6 +91,9 @@ popd
 
 %patch6 -p1 -b .undefined-pcf-glyph
 
+%patch7 -p1 -b .png-bitmap-size
+%patch8 -p1 -b .png-memory-leak
+
 %build
 
 %configure --disable-static \
@@ -198,6 +205,11 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/*.{a,la}
 %{_mandir}/man1/*
 
 %changelog
+* Fri Oct 23 2020 Marek Kasik <maksik@redhat.com> - 2.10.0-4
+- Test bitmap size earlier for PNGs
+- Fix memory leak in pngshim.c
+- Resolves: #1890211
+
 * Thu Jul 25 2019 Fedora Release Engineering <releng@fedoraproject.org> - 2.10.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild