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[cff] Protect against invalid `vsindex' and `blend' values. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=305

* src/cff/cf2intrp.c (cf2_interpT2CharString) <cf2_cmdVSINDEX,
cf2_cmdBLEND>: Implement it.
This commit is contained in:
Werner Lemberg 2016-12-22 08:30:15 +01:00
parent ada8297175
commit b44e6c2035
2 changed files with 25 additions and 3 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
2016-12-22 Werner Lemberg <wl@gnu.org>
[cff] Protect against invalid `vsindex' and `blend' values.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=305
* src/cff/cf2intrp.c (cf2_interpT2CharString) <cf2_cmdVSINDEX,
cf2_cmdBLEND>: Implement it.
2016-12-22 Werner Lemberg <wl@gnu.org>
[ftfuzzer] Always use Adobe CFF engine.

17
src/cff/cf2intrp.c
View File

@ -659,7 +659,13 @@
goto exit;
}
font->vsindex = (FT_UInt)cf2_stack_popInt( opStack );
{
FT_Int temp = cf2_stack_popInt( opStack );
if ( temp >= 0 )
font->vsindex = (FT_UInt)temp;
}
break;
case cf2_cmdBLEND:
@ -687,7 +693,12 @@
}
/* do the blend */
numBlends = (FT_UInt)cf2_stack_popInt( opStack );
{
FT_Int temp = cf2_stack_popInt( opStack );
numBlends = temp > 0 ? (FT_UInt)temp : 0;
}
cf2_doBlend( &font->blend, opStack, numBlends );
font->blend.usedBV = TRUE;
@ -1225,7 +1236,7 @@
idx = cf2_stack_popInt( opStack );
if ( idx >= 0 && idx < CF2_STORAGE_SIZE )
cf2_stack_pushFixed( opStack, storage[idx] );
cf2_stack_pushFixed( opStack, storage[idx] );
}
continue; /* do not clear the stack */