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[sfnt] Fix Savannah bug #43590. 

* src/sfnt/ttload.c (check_table_dir, tt_face_load_font_dir):
Protect against addition overflow.
This commit is contained in:
Werner Lemberg 2014-11-12 21:26:44 +01:00
parent f46add1389
commit 677ddf4f1d
2 changed files with 16 additions and 3 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2014-11-12 Werner Lemberg <wl@gnu.org>
[sfnt] Fix Savannah bug #43590.
* src/sfnt/ttload.c (check_table_dir, tt_face_load_font_dir):
Protect against addition overflow.
2014-11-12 Werner Lemberg <wl@gnu.org> 2014-11-12 Werner Lemberg <wl@gnu.org>
[sfnt] Fix Savannah bug #43589. [sfnt] Fix Savannah bug #43589.

12
src/sfnt/ttload.c
View File

@ -5,7 +5,7 @@
/* Load the basic TrueType tables, i.e., tables that can be either in */ /* Load the basic TrueType tables, i.e., tables that can be either in */
/* TTF or OTF fonts (body). */ /* TTF or OTF fonts (body). */
/* */ /* */
/* Copyright 1996-2010, 2012, 2013 by */ /* Copyright 1996-2010, 2012-2014 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */ /* */
/* This file is part of the FreeType project, and may only be used, */ /* This file is part of the FreeType project, and may only be used, */
@ -207,7 +207,10 @@
} }
/* we ignore invalid tables */ /* we ignore invalid tables */
if ( table.Offset + table.Length > stream->size )
/* table.Offset + table.Length > stream->size ? */
if ( table.Length > stream->size ||
table.Offset > stream->size - table.Length )
{ {
FT_TRACE2(( "check_table_dir: table entry %d invalid\n", nn )); FT_TRACE2(( "check_table_dir: table entry %d invalid\n", nn ));
continue; continue;
@ -395,7 +398,10 @@
entry->Length = FT_GET_ULONG(); entry->Length = FT_GET_ULONG();
/* ignore invalid tables */ /* ignore invalid tables */
if ( entry->Offset + entry->Length > stream->size )
/* entry->Offset + entry->Length > stream->size ? */
if ( entry->Length > stream->size ||
entry->Offset > stream->size - entry->Length )
continue; continue;
else else
{ {