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[cff] Fix handling of `roll' op in old engine. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10080

* src/psaux/cffdecode.c (cff_decoder_parse_charstrings) <cff_op_roll>
[CFF_CONFIG_OPTION_OLD_ENGINE]: Use modulo for loop count, as
documented in the specification.
This commit is contained in:
Werner Lemberg 2018-08-29 06:53:54 +02:00
parent 2c8e6279a7
commit 3915a18b8c
3 changed files with 20 additions and 0 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2018-08-29 Werner Lemberg <wl@gnu.org>
[cff] Fix handling of `roll' op in old engine.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10080
* src/psaux/cffdecode.c (cff_decoder_parse_charstrings) <cff_op_roll>
[CFF_CONFIG_OPTION_OLD_ENGINE]: Use modulo for loop count, as
documented in the specification.
2018-08-26 Werner Lemberg <wl@gnu.org>
* src/truetype/ttobjs.c (tt_size_read_bytecode): Trace CVT values.

5
src/psaux/cffdecode.c
View File

@ -1821,6 +1821,7 @@
if ( idx >= 0 )
{
idx = idx % count;
while ( idx > 0 )
{
FT_Fixed tmp = args[count - 1];
@ -1835,6 +1836,10 @@
}
else
{
/* before C99 it is implementation-defined whether */
/* the result of `%' is negative if the first operand */
/* is negative */
idx = -( ( -idx ) % count );
while ( idx < 0 )
{
FT_Fixed tmp = args[0];

3
src/psaux/psstack.c
View File

@ -258,6 +258,9 @@
return;
}
/* before C99 it is implementation-defined whether */
/* the result of `%' is negative if the first operand */
/* is negative */
if ( shift < 0 )
shift = -( ( -shift ) % count );
else