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[winfonts] Check alignment shift count for resource data (#45938).

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* src/winfonts/winfnt.c (fnt_face_get_dll_font): Implement it.
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Werner Lemberg 2015-09-13 09:21:52 +02:00
parent e3058617f3
commit 3df92aa04c
2 changed files with 21 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2015-09-13 Werner Lemberg <wl@gnu.org>
[winfonts] Check alignment shift count for resource data (#45938).
* src/winfonts/winfnt.c (fnt_face_get_dll_font): Implement it.
2015-09-13 Werner Lemberg <wl@gnu.org>
[type1] Fix potential buffer overflow (#45923).

15
src/winfonts/winfnt.c
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@ -320,6 +320,21 @@
size_shift = FT_GET_USHORT_LE();
/* Microsoft's specification of the executable-file header format */
/* for `New Executable' (NE) doesn't give a limit for the */
/* alignment shift count; however, in 1985, the year of the */
/* specification release, only 32bit values were supported, thus */
/* anything larger than 16 doesn't make sense in general, given */
/* that file offsets are 16bit values, shifted by the alignment */
/* shift count */
if ( size_shift > 16 )
{
FT_TRACE2(( "invalid alignment shift count for resource data\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
for (;;)
{
FT_UShort type_id, count;