[gimp/gimp-2-10] app: disallow saving of patterns larger than max allowed dimensions

[Jacob Boerema <jboerema src gnome org>]

commit d9e82494b4204f467c63f5df7a19019292a2a3a4
Author: Jacob Boerema <jgboerema gmail com>
Date:   Mon Aug 9 16:32:55 2021 -0400

    app: disallow saving of patterns larger than max allowed dimensions
    
    For GIMP patterns we have maximum allowed dimensions which we check when
    loading a pattern. However, we did not check this when saving a pattern.
    See issue #6032.
    
    This commit adds a check when saving a pattern and adds a descriptive
    error to make clear why saving fails.
    
    (cherry picked from commit f130fe1917e929fcdb83f58ab268687f571c5269)

 app/core/gimppattern-save.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/app/core/gimppattern-save.c b/app/core/gimppattern-save.c
index c745ab2063..b9ded3ea3d 100644
--- a/app/core/gimppattern-save.c
+++ b/app/core/gimppattern-save.c
@@ -26,6 +26,8 @@
 #include "gimppattern-save.h"
 #include "gimptempbuf.h"
 
+#include "gimp-intl.h"
+
 
 gboolean
 gimp_pattern_save (GimpData       *data,
@@ -44,6 +46,15 @@ gimp_pattern_save (GimpData       *data,
   width  = gimp_temp_buf_get_width  (mask);
   height = gimp_temp_buf_get_height (mask);
 
+  if (width > GIMP_PATTERN_MAX_SIZE || height > GIMP_PATTERN_MAX_SIZE)
+    {
+      g_set_error (error, GIMP_DATA_ERROR, GIMP_DATA_ERROR_READ,
+                   _("Unsupported pattern dimensions %d x %d.\n"
+                     "GIMP Patterns have a maximum size of %d x %d."),
+                   width, height,
+                   GIMP_PATTERN_MAX_SIZE, GIMP_PATTERN_MAX_SIZE);
+      return FALSE;
+    }
   header.header_size  = g_htonl (sizeof (GimpPatternHeader) +
                                  strlen (name) + 1);
   header.version      = g_htonl (1);