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[truetype] Improve VF check. 

Triggered by

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10255

* src/truetype/ttgxvar.c (ft_var_load_gvar): Use better limit check
for `tupleCount'.
This commit is contained in:
Werner Lemberg 2018-09-12 07:40:49 +02:00
parent 53c5e4bd87
commit 65681e6dc1
2 changed files with 18 additions and 4 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
2018-09-12 Werner Lemberg <wl@gnu.org>
[truetype] Improve VF check.
Triggered by
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10255
* src/truetype/ttgxvar.c (ft_var_load_gvar): Use better limit check
for `tupleCount'.
2018-09-12 Werner Lemberg <wl@gnu.org>
* src/truetype/ttgxvar.c (ft_var_load_gvar): Check `glyphoffsets'.

11
src/truetype/ttgxvar.c
View File

@ -3672,6 +3672,7 @@
FT_UInt tupleCount;
FT_ULong offsetToData;
FT_ULong dataSize;
FT_ULong here;
FT_UInt i, j;
@ -3712,9 +3713,11 @@
FT_NEW_ARRAY( has_delta, n_points ) )
goto Fail1;
if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) ||
FT_FRAME_ENTER( blend->glyphoffsets[glyph_index + 1] -
blend->glyphoffsets[glyph_index] ) )
dataSize = blend->glyphoffsets[glyph_index + 1] -
blend->glyphoffsets[glyph_index];
if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) ||
FT_FRAME_ENTER( dataSize ) )
goto Fail1;
glyph_start = FT_Stream_FTell( stream );
@ -3731,7 +3734,7 @@
/* rough sanity test */
if ( offsetToData + ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) * 4 >
blend->gvar_size )
dataSize )
{
FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:"
" invalid glyph variation array header\n" ));