[Git][wine/wine][master] gdiplus: Avoid storing NULL in gdip_font_link_section.

[Alexandre Julliard (＠julliard)]

Alexandre Julliard pushed to branch master at wine / wine

Commits:
b932b10f by Eric Tian at 2025-04-02T17:11:52+02:00
gdiplus: Avoid storing NULL in gdip_font_link_section.

In generate_font_link_info, because the return value of
GdipCreateFontFromDC is not checked, section->font might be set to NULL.
GdipMeasureString calls gdip_format_string, which then calls
generate_font_link_info and font_link_get_text_extent_point. In
font_link_get_text_extent_point, the font from gdip_font_link_section is also
not checked for NULL, which may cause a crash.

Therefore, in generate_font_link_info, when GdipCreateFontFromDC fails,
store (GpFont *)base_font (as with IMLangFontLink_MapFont failure) to ensure
the font in gdip_font_link_section is valid.

- - - - -

1 changed file:

- dlls/gdiplus/graphics.c

View it on GitLab: https://gitlab.winehq.org/wine/wine/-/commit/b932b10fe28048d760562ff6d7b4485...