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[psaux] 32bit integer overflow tun-time errors (#46149). 

* src/psaux/t1decode.c (t1_decoder_parse_charstrings): Use
OVERFLOW_ADD_LONG and OVERFLOW_SUB_LONG where appropriate.
This commit is contained in:
Werner Lemberg 2017-06-01 13:15:54 +02:00
parent 8d435c463d
commit 4a1f1a6d2a
2 changed files with 60 additions and 39 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2017-06-01 Werner Lemberg <wl@gnu.org>
[psaux] 32bit integer overflow tun-time errors (#46149).
* src/psaux/t1decode.c (t1_decoder_parse_charstrings): Use
OVERFLOW_ADD_LONG and OVERFLOW_SUB_LONG where appropriate.
2017-06-01 Werner Lemberg <wl@gnu.org>
* src/truetype/ttinterp.c (TT_RunIns): Adjust loop counter again.

92
src/psaux/t1decode.c
View File

@ -864,7 +864,9 @@
for ( mm = 1; mm < blend->num_designs; mm++ )
tmp += FT_MulFix( *delta++, blend->weight_vector[mm] );
tmp = OVERFLOW_ADD_LONG(
tmp,
FT_MulFix( *delta++, blend->weight_vector[mm] ) );
*values++ = tmp;
}
@ -904,7 +906,7 @@
if ( arg_cnt != 2 )
goto Unexpected_OtherSubr;
top[0] += top[1]; /* XXX (over|under)flow */
top[0] = OVERFLOW_ADD_LONG( top[0], top[1] );
known_othersubr_result_cnt = 1;
break;
@ -915,7 +917,7 @@
if ( arg_cnt != 2 )
goto Unexpected_OtherSubr;
top[0] -= top[1]; /* XXX (over|under)flow */
top[0] = OVERFLOW_SUB_LONG( top[0], top[1] );
known_othersubr_result_cnt = 1;
break;
@ -1147,11 +1149,13 @@
builder->parse_state = T1_Parse_Have_Width;
builder->left_bearing.x += top[0];
builder->advance.x = top[1];
builder->advance.y = 0;
builder->left_bearing.x = OVERFLOW_ADD_LONG(
builder->left_bearing.x, top[0] );
orig_x = x = builder->pos_x + top[0];
builder->advance.x = top[1];
builder->advance.y = 0;
orig_x = x = OVERFLOW_ADD_LONG( builder->pos_x, top[0] );
orig_y = y = builder->pos_y;
FT_UNUSED( orig_y );
@ -1177,13 +1181,16 @@
builder->parse_state = T1_Parse_Have_Width;
builder->left_bearing.x += top[0];
builder->left_bearing.y += top[1];
builder->advance.x = top[2];
builder->advance.y = top[3];
builder->left_bearing.x = OVERFLOW_ADD_LONG(
builder->left_bearing.x, top[0] );
builder->left_bearing.y = OVERFLOW_ADD_LONG(
builder->left_bearing.y, top[1] );
x = builder->pos_x + top[0];
y = builder->pos_y + top[1];
builder->advance.x = top[2];
builder->advance.y = top[3];
x = OVERFLOW_ADD_LONG( builder->pos_x, top[0] );
y = OVERFLOW_ADD_LONG( builder->pos_y, top[1] );
/* the `metrics_only' indicates that we only want to compute */
/* the glyph's metrics (lsb + advance width), not load the */
@ -1210,13 +1217,14 @@
if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) )
goto Fail;
x += top[0];
x = OVERFLOW_ADD_LONG( x, top[0] );
goto Add_Line;
case op_hmoveto:
FT_TRACE4(( " hmoveto" ));
x += top[0];
x = OVERFLOW_ADD_LONG( x, top[0] );
if ( !decoder->flex_state )
{
if ( builder->parse_state == T1_Parse_Start )
@ -1232,12 +1240,14 @@
FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) )
goto Fail;
x += top[0];
x = OVERFLOW_ADD_LONG( x, top[0] );
t1_builder_add_point( builder, x, y, 0 );
x += top[1];
y += top[2];
x = OVERFLOW_ADD_LONG( x, top[1] );
y = OVERFLOW_ADD_LONG( y, top[2] );
t1_builder_add_point( builder, x, y, 0 );
y += top[3];
y = OVERFLOW_ADD_LONG( y, top[3] );
t1_builder_add_point( builder, x, y, 1 );
break;
@ -1247,8 +1257,8 @@
if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) )
goto Fail;
x += top[0];
y += top[1];
x = OVERFLOW_ADD_LONG( x, top[0] );
y = OVERFLOW_ADD_LONG( y, top[1] );
Add_Line:
if ( FT_SET_ERROR( t1_builder_add_point1( builder, x, y ) ) )
@ -1258,8 +1268,9 @@
case op_rmoveto:
FT_TRACE4(( " rmoveto" ));
x += top[0];
y += top[1];
x = OVERFLOW_ADD_LONG( x, top[0] );
y = OVERFLOW_ADD_LONG( y, top[1] );
if ( !decoder->flex_state )
{
if ( builder->parse_state == T1_Parse_Start )
@ -1275,16 +1286,16 @@
FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) )
goto Fail;
x += top[0];
y += top[1];
x = OVERFLOW_ADD_LONG( x, top[0] );
y = OVERFLOW_ADD_LONG( y, top[1] );
t1_builder_add_point( builder, x, y, 0 );
x += top[2];
y += top[3];
x = OVERFLOW_ADD_LONG( x, top[2] );
y = OVERFLOW_ADD_LONG( y, top[3] );
t1_builder_add_point( builder, x, y, 0 );
x += top[4];
y += top[5];
x = OVERFLOW_ADD_LONG( x, top[4] );
y = OVERFLOW_ADD_LONG( y, top[5] );
t1_builder_add_point( builder, x, y, 1 );
break;
@ -1295,12 +1306,14 @@
FT_SET_ERROR( t1_builder_check_points( builder, 3 ) ) )
goto Fail;
y += top[0];
y = OVERFLOW_ADD_LONG( y, top[0] );
t1_builder_add_point( builder, x, y, 0 );
x += top[1];
y += top[2];
x = OVERFLOW_ADD_LONG( x, top[1] );
y = OVERFLOW_ADD_LONG( y, top[2] );
t1_builder_add_point( builder, x, y, 0 );
x += top[3];
x = OVERFLOW_ADD_LONG( x, top[3] );
t1_builder_add_point( builder, x, y, 1 );
break;
@ -1310,13 +1323,14 @@
if ( FT_SET_ERROR( t1_builder_start_point( builder, x, y ) ) )
goto Fail;
y += top[0];
y = OVERFLOW_ADD_LONG( y, top[0] );
goto Add_Line;
case op_vmoveto:
FT_TRACE4(( " vmoveto" ));
y += top[0];
y = OVERFLOW_ADD_LONG( y, top[0] );
if ( !decoder->flex_state )
{
if ( builder->parse_state == T1_Parse_Start )
@ -1473,7 +1487,7 @@
/* record vertical hint */
if ( hinter )
{
top[0] += orig_x;
top[0] = OVERFLOW_ADD_LONG( top[0], orig_x );
hinter->stem( hinter->hints, 0, top );
}
break;
@ -1487,9 +1501,9 @@
FT_Pos dx = orig_x;
top[0] += dx;
top[2] += dx;
top[4] += dx;
top[0] = OVERFLOW_ADD_LONG( top[0], dx );
top[2] = OVERFLOW_ADD_LONG( top[2], dx );
top[4] = OVERFLOW_ADD_LONG( top[4], dx );
hinter->stem3( hinter->hints, 0, top );
}
break;