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[truetype] Improve handling of stack underflow. 

* src/truetype/ttinterp.c (TT_RunIns, Ins_FLIPPT, Ins_DELTAP,
Ins_DELTAC): Exit with error only if `pedantic_hinting' is set.
Otherwise, try to do something sane.
This commit is contained in:
Werner Lemberg 2011-01-31 10:24:32 +01:00
parent 91a97164ca
commit 96f0456483
2 changed files with 44 additions and 13 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2011-01-31 Werner Lemberg <wl@gnu.org>
[truetype] Improve handling of stack underflow.
* src/truetype/ttinterp.c (TT_RunIns, Ins_FLIPPT, Ins_DELTAP,
Ins_DELTAC): Exit with error only if `pedantic_hinting' is set.
Otherwise, try to do something sane.
2011-01-30 Werner Lemberg <wl@gnu.org>
* src/sfnt/ttmtx.c (tt_face_load_hmtx): Fix tracing message.

31
src/truetype/ttinterp.c
View File

@ -5463,10 +5463,14 @@
if ( CUR.top < CUR.GS.loop )
{
if ( CUR.pedantic_hinting )
{
CUR.error = TT_Err_Too_Few_Arguments;
return;
}
CUR.GS.loop = CUR.top;
}
while ( CUR.GS.loop > 0 )
{
@ -6859,8 +6863,9 @@
if ( CUR.args < n )
{
if ( CUR.pedantic_hinting )
CUR.error = TT_Err_Too_Few_Arguments;
return;
n = CUR.args;
}
CUR.args -= n;
@ -6876,8 +6881,10 @@
{
if ( CUR.args < 2 )
{
if ( CUR.pedantic_hinting )
CUR.error = TT_Err_Too_Few_Arguments;
return;
CUR.args = 0;
goto Fail;
}
CUR.args -= 2;
@ -6926,6 +6933,7 @@
CUR.error = TT_Err_Invalid_Reference;
}
Fail:
CUR.new_top = CUR.args;
}
@ -6953,8 +6961,9 @@
if ( CUR.args < n )
{
if ( CUR.pedantic_hinting )
CUR.error = TT_Err_Too_Few_Arguments;
return;
n = CUR.args;
}
CUR.args -= n;
@ -6969,8 +6978,10 @@
{
if ( CUR.args < 2 )
{
if ( CUR.pedantic_hinting )
CUR.error = TT_Err_Too_Few_Arguments;
return;
CUR.args = 0;
goto Fail;
}
CUR.args -= 2;
@ -7018,6 +7029,7 @@
}
}
Fail:
CUR.new_top = CUR.args;
}
@ -7478,11 +7490,22 @@
/* `args' is the top of the stack once arguments have been popped. */
/* One can also interpret it as the index of the last argument. */
if ( CUR.args < 0 )
{
FT_UShort i;
if ( CUR.pedantic_hinting )
{
CUR.error = TT_Err_Too_Few_Arguments;
goto LErrorLabel_;
}
/* push zeroes onto the stack */
for ( i = 0; i < Pop_Push_Count[CUR.opcode] >> 4; i++ )
CUR.stack[i] = 0;
CUR.args = 0;
}
CUR.new_top = CUR.args + ( Pop_Push_Count[CUR.opcode] & 15 );
/* `new_top' is the new top of the stack, after the instruction's */