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[base] Refuse to render enormous outlines (#47114). 

The goal is to avoid integer overflows in the rendering algorithms.
The limit is chosen arbitrarily at some 2^18 pixels, which should be
enough for modern devices including printers.

* src/base/ftoutln.c (FT_Outline_Render): Check CBox and reject
enormous outlines.
This commit is contained in:
Alexei Podtelezhnikov 2016-03-06 23:54:34 -05:00
parent d0b0e31ed7
commit 495de6cc72
2 changed files with 17 additions and 0 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2016-03-06 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] Refuse to render enormous outlines (#47114).
The goal is to avoid integer overflows in the rendering algorithms.
The limit is chosen arbitrarily at some 2^18 pixels, which should be
enough for modern devices including printers.
* src/base/ftoutln.c (FT_Outline_Render): Check CBox and reject
enormous outlines.
2016-03-06 Alexei Podtelezhnikov <apodtele@gmail.com>
[smooth] Replace left shifts with multiplications (#47114).

6
src/base/ftoutln.c
View File

@ -618,6 +618,7 @@
FT_Error error;
FT_Renderer renderer;
FT_ListNode node;
FT_BBox cbox;
if ( !library )
@ -629,6 +630,11 @@
if ( !params )
return FT_THROW( Invalid_Argument );
FT_Outline_Get_CBox( outline, &cbox );
if ( cbox.xMin < -0x1000000L || cbox.yMin < -0x1000000L ||
cbox.xMax > 0x1000000L || cbox.yMax > 0x1000000L )
return FT_THROW( Invalid_Outline );
renderer = library->cur_renderer;
node = library->renderers.head;