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[pfr] Add some safety guards. 

* src/pfr/pfrload.c (pfr_phy_font_load): Check resolutions and number of
characters.

Fixes #1174.
This commit is contained in:
Werner Lemberg 2022-07-26 16:08:00 +02:00
parent 1f005c0918
commit 182295cbcf
1 changed files with 15 additions and 0 deletions
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15
src/pfr/pfrload.c
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@ -852,6 +852,14 @@
phy_font->bbox.yMax = PFR_NEXT_SHORT( p );
phy_font->flags = flags = PFR_NEXT_BYTE( p );
if ( !phy_font->outline_resolution ||
!phy_font->metrics_resolution )
{
error = FT_THROW( Invalid_Table );
FT_ERROR(( "pfr_phy_font_load: invalid resolution\n" ));
goto Fail;
}
/* get the standard advance for non-proportional fonts */
if ( !( flags & PFR_PHY_PROPORTIONAL ) )
{
@ -969,6 +977,13 @@
phy_font->num_chars = count = PFR_NEXT_USHORT( p );
phy_font->chars_offset = offset + (FT_Offset)( p - stream->cursor );
if ( !phy_font->num_chars )
{
error = FT_THROW( Invalid_Table );
FT_ERROR(( "pfr_phy_font_load: no glyphs\n" ));
goto Fail;
}
Size = 1 + 1 + 2;
if ( flags & PFR_PHY_2BYTE_CHARCODE )
Size += 1;