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Fix invalid memory access in `bsdf` rasterizer. 

Do not generate SDF from bitmap if the `FT_GLYPH_OWN_BITMAP` flag is not
set.  In some cases the bitmap buffer is freed but still points to a valid
address; to handle those cases check the flag before accessing the memory.

* src/sdf/ftsdfrend.c (ft_bsdf_render): Handle the above case.
Also, return an error message if the bitmap's rows/pitch is invalid,
otherwise `slot->buffer` might be assigned to some invalid memory location.
(ft_sdf_render): Same as above.
Plus, move the outline back to original state after rasterization and not if
any error occurs.

Signed-off-by: Anuj Verma <anujv@iitbhilai.ac.in>
This commit is contained in:
Anuj Verma 2021-08-02 08:40:43 +05:30 committed by Werner Lemberg
parent 47b1a541cb
commit ebcc96e559
1 changed files with 28 additions and 4 deletions
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32
src/sdf/ftsdfrend.c
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@ -298,8 +298,15 @@
goto Exit;
}
/* the rows and pitch must be valid after presetting the */
/* bitmap using outline */
if ( !bitmap->rows || !bitmap->pitch )
{
FT_ERROR(( "ft_sdf_render: failed to preset bitmap\n" ));
error = FT_THROW( Cannot_Render_Glyph );
goto Exit;
}
/* the padding will simply be equal to the `spread' */
x_pad = sdf_module->spread;
@ -350,6 +357,10 @@
error = render->raster_render( render->raster,
(const FT_Raster_Params*)&params );
/* transform the outline back to the original state */
if ( x_shift || y_shift )
FT_Outline_Translate( outline, -x_shift, -y_shift );
Exit:
if ( !error )
{
@ -362,9 +373,6 @@
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
}
if ( x_shift || y_shift )
FT_Outline_Translate( outline, -x_shift, -y_shift );
return error;
}
@ -506,8 +514,24 @@
goto Exit;
}
if ( !bitmap->rows || !bitmap->pitch )
/* Do not generate SDF if the bitmap is not owned by the */
/* glyph: it might be that the source buffer is already freed. */
if ( !( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) )
{
FT_ERROR(( "ft_bsdf_render: can't generate SDF from"
" unowned source bitmap\n" ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
if ( !bitmap->rows || !bitmap->pitch )
{
FT_ERROR(( "ft_bsdf_render: invalid bitmap size\n" ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
FT_Bitmap_New( &target );