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libgimp, plug-ins: Prevent GFig crash with NULL brush

Browse source 
The GFig plug-in assumes that there is always
a valid brush selected when creating its
dialogue. However, a NULL brush is possible,
and GFig's assumption can cause a crash
in GIMP by attempting to get a buffer from
a NULL brush.
This patch adds conditional checks for the
brush to not be NULL before using it.
This commit is contained in:
Alx Sa 2025-05-05 09:36:04 +00:00
parent 373e46f871
commit 2c31c0e34d
5 changed files with 54 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

17
app/pdb/brush-cmds.c
View file

@ -162,19 +162,22 @@ brush_get_info_invoker (GimpProcedure *procedure,
{
GimpTempBuf *mask = gimp_brush_get_mask (brush);
GimpTempBuf *pixmap = gimp_brush_get_pixmap (brush);
const Babl *format;
const Babl *format = NULL;
format = gimp_babl_compat_u8_mask_format (
gimp_temp_buf_get_format (mask));
if (brush)
format = gimp_babl_compat_u8_mask_format (gimp_temp_buf_get_format (mask));
width = gimp_brush_get_width (brush);
height = gimp_brush_get_height (brush);
mask_bpp = babl_format_get_bytes_per_pixel (format);
if (pixmap)
if (format)
mask_bpp = babl_format_get_bytes_per_pixel (format);
else
mask_bpp = 0;
if (pixmap && format)
{
format = gimp_babl_compat_u8_format (
gimp_temp_buf_get_format (pixmap));
format = gimp_babl_compat_u8_format (gimp_temp_buf_get_format (pixmap));
color_bpp = babl_format_get_bytes_per_pixel (format);
}

2
libgimp/gimpbrushchooser.c
View file

@ -217,6 +217,8 @@ gimp_brush_chooser_get_brush_bitmap (GimpBrushChooser *chooser,
GimpBrush *brush;
g_object_get (chooser, "resource", &brush, NULL);
if (! brush)
return;
if (chooser->brush == brush &&
chooser->width == width &&

17
pdb/groups/brush.pdb
View file

@ -138,19 +138,22 @@ HELP
{
GimpTempBuf *mask = gimp_brush_get_mask (brush);
GimpTempBuf *pixmap = gimp_brush_get_pixmap (brush);
const Babl *format;
const Babl *format = NULL;
format = gimp_babl_compat_u8_mask_format (
gimp_temp_buf_get_format (mask));
if (brush)
format = gimp_babl_compat_u8_mask_format (gimp_temp_buf_get_format (mask));
width = gimp_brush_get_width (brush);
height = gimp_brush_get_height (brush);
mask_bpp = babl_format_get_bytes_per_pixel (format);
if (pixmap)
if (format)
mask_bpp = babl_format_get_bytes_per_pixel (format);
else
mask_bpp = 0;
if (pixmap && format)
{
format = gimp_babl_compat_u8_format (
gimp_temp_buf_get_format (pixmap));
format = gimp_babl_compat_u8_format (gimp_temp_buf_get_format (pixmap));
color_bpp = babl_format_get_bytes_per_pixel (format);
}

3
plug-ins/gfig/gfig-dialog.c
View file

@ -630,7 +630,8 @@ gfig_dialog (GimpGfig *gfig)
gfig_list_load_all (gfig_path);
/* Setup initial brush settings */
set_context_bdesc (gimp_context_get_brush ());
if (gimp_context_get_brush ())
set_context_bdesc (gimp_context_get_brush ());
gtk_widget_show (main_hbox);

43
plug-ins/gfig/gfig-style.c
View file

@ -533,7 +533,8 @@ gfig_brush_changed_callback (gpointer user_data,
current_style->brush = brush;
/* this will soon be unneeded. How soon? */
set_context_bdesc (brush);
if (brush)
set_context_bdesc (brush);
gimp_context_set_brush (brush);
gimp_context_set_brush_default_size ();
@ -660,12 +661,24 @@ gfig_read_gimp_style (Style *style,
style->fill_opacity = 100.;
/* Cache attributes of brush. */
gimp_brush_get_info (style->brush,
&style->brush_width, &style->brush_height,
&dummy, &dummy);
style->brush_spacing = gimp_brush_get_spacing (style->brush);
if (style->brush)
{
gimp_brush_get_info (style->brush,
&style->brush_width, &style->brush_height,
&dummy, &dummy);
style->brush_spacing = gimp_brush_get_spacing (style->brush);
set_context_bdesc (style->brush);
set_context_bdesc (style->brush);
}
else
{
style->brush_width = 1;
style->brush_height = 1;
style->brush_spacing = 1;
gfig_context->bdesc.width = 48;
gfig_context->bdesc.height = 48;
}
}
/*
@ -695,16 +708,20 @@ gfig_style_set_context_from_style (Style *style)
gimp_context_set_brush_default_size ();
gimp_resource_chooser_set_resource (GIMP_RESOURCE_CHOOSER (gfig_context->brush_select),
GIMP_RESOURCE (style->brush));
if (style->brush)
gimp_resource_chooser_set_resource (GIMP_RESOURCE_CHOOSER (gfig_context->brush_select),
GIMP_RESOURCE (style->brush));
gimp_resource_chooser_set_resource (GIMP_RESOURCE_CHOOSER (gfig_context->pattern_select),
GIMP_RESOURCE (style->pattern));
if (style->pattern)
gimp_resource_chooser_set_resource (GIMP_RESOURCE_CHOOSER (gfig_context->pattern_select),
GIMP_RESOURCE (style->pattern));
gimp_resource_chooser_set_resource (GIMP_RESOURCE_CHOOSER (gfig_context->gradient_select),
GIMP_RESOURCE (style->gradient));
if (style->gradient)
gimp_resource_chooser_set_resource (GIMP_RESOURCE_CHOOSER (gfig_context->gradient_select),
GIMP_RESOURCE (style->gradient));
set_context_bdesc (style->brush);
if (style->brush)
set_context_bdesc (style->brush);
if (gfig_context->debug_styles)
g_printerr ("done.\n");