[gimp] fixes for some buffer overflow problems (see bug #639203)

[Simon Budig <simon src gnome org>]

commit 7fb0300e1cfdb98a3bde54dbc73a0f3eda375162
Author: Simon Budig <simon budig de>
Date:   Tue Jan 11 23:28:16 2011 +0100

    fixes for some buffer overflow problems (see bug #639203)

 plug-ins/common/sphere-designer.c |    5 ++++-
 plug-ins/gfig/gfig-style.c        |    8 +++++++-
 plug-ins/lighting/lighting-ui.c   |   27 +++++++++++++++++++++++----
 3 files changed, 34 insertions(+), 6 deletions(-)
---
diff --git a/plug-ins/common/sphere-designer.c b/plug-ins/common/sphere-designer.c
index 4e5b982..6dea871 100644
--- a/plug-ins/common/sphere-designer.c
+++ b/plug-ins/common/sphere-designer.c
@@ -1993,6 +1993,7 @@ loadit (const gchar * fn)
   gchar    endbuf[21 * (G_ASCII_DTOSTR_BUF_SIZE + 1)];
   gchar   *end = endbuf;
   gchar    line[1024];
+  gchar    fmt_str[16];
   gint     i;
   texture *t;
   gint     majtype, type;
@@ -2017,6 +2018,8 @@ loadit (const gchar * fn)
 
   s.com.numtexture = 0;
 
+  snprintf (fmt_str, sizeof (fmt_str), "%%d %%d %%%lds", sizeof (endbuf) - 1);
+
   while (!feof (f))
     {
 
@@ -2027,7 +2030,7 @@ loadit (const gchar * fn)
       t = &s.com.texture[i];
       setdefaults (t);
 
-      if (sscanf (line, "%d %d %s", &t->majtype, &t->type, end) != 3)
+      if (sscanf (line, fmt_str, &t->majtype, &t->type, end) != 3)
         t->color1.x = g_ascii_strtod (end, &end);
       if (end && errno != ERANGE)
         t->color1.y = g_ascii_strtod (end, &end);
diff --git a/plug-ins/gfig/gfig-style.c b/plug-ins/gfig/gfig-style.c
index ee1c7b2..eae78f8 100644
--- a/plug-ins/gfig/gfig-style.c
+++ b/plug-ins/gfig/gfig-style.c
@@ -164,6 +164,7 @@ gfig_read_parameter_gimp_rgb (gchar        **text,
   gchar *ptr;
   gchar *tmpstr;
   gchar *endptr;
+  gchar  fmt_str[32];
   gchar  colorstr_r[G_ASCII_DTOSTR_BUF_SIZE];
   gchar  colorstr_g[G_ASCII_DTOSTR_BUF_SIZE];
   gchar  colorstr_b[G_ASCII_DTOSTR_BUF_SIZE];
@@ -171,6 +172,10 @@ gfig_read_parameter_gimp_rgb (gchar        **text,
 
   style_entry->r = style_entry->g = style_entry->b = style_entry->a = 0.;
 
+  snprintf (fmt_str, sizeof (fmt_str), "%%%lds %%%lds %%%lds %%%lds",
+            sizeof (colorstr_r) - 1, sizeof (colorstr_g) - 1,
+            sizeof (colorstr_b) - 1, sizeof (colorstr_a) - 1);
+
   while (n < nitems)
     {
       ptr = strchr (text[n], ':');
@@ -180,7 +185,8 @@ gfig_read_parameter_gimp_rgb (gchar        **text,
           ptr++;
           if (!strcmp (tmpstr, name))
             {
-              sscanf (ptr, "%s %s %s %s", colorstr_r, colorstr_g, colorstr_b, colorstr_a);
+              sscanf (ptr, fmt_str,
+                      colorstr_r, colorstr_g, colorstr_b, colorstr_a);
               style_entry->r = g_ascii_strtod (colorstr_r, &endptr);
               style_entry->g = g_ascii_strtod (colorstr_g, &endptr);
               style_entry->b = g_ascii_strtod (colorstr_b, &endptr);
diff --git a/plug-ins/lighting/lighting-ui.c b/plug-ins/lighting/lighting-ui.c
index 99fb348..126f6e2 100644
--- a/plug-ins/lighting/lighting-ui.c
+++ b/plug-ins/lighting/lighting-ui.c
@@ -1345,6 +1345,7 @@ load_preset_response (GtkFileChooser *chooser,
   gchar          buffer3[G_ASCII_DTOSTR_BUF_SIZE];
   gchar          type_label[21];
   gchar         *endptr;
+  gchar          fmt_str[32];
 
   if (response_id == GTK_RESPONSE_OK)
     {
@@ -1384,23 +1385,41 @@ load_preset_response (GtkFileChooser *chooser,
                   return;
                 }
 
-              fscanf (fp, " Position: %s %s %s", buffer1, buffer2, buffer3);
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Position: %%%lds %%%lds %%%lds",
+                        sizeof (buffer1) - 1,
+                        sizeof (buffer2) - 1,
+                        sizeof (buffer3) - 1);
+              fscanf (fp, fmt_str, buffer1, buffer2, buffer3);
               source->position.x = g_ascii_strtod (buffer1, &endptr);
               source->position.y = g_ascii_strtod (buffer2, &endptr);
               source->position.z = g_ascii_strtod (buffer3, &endptr);
 
-              fscanf (fp, " Direction: %s %s %s", buffer1, buffer2, buffer3);
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Direction: %%%lds %%%lds %%%lds",
+                        sizeof (buffer1) - 1,
+                        sizeof (buffer2) - 1,
+                        sizeof (buffer3) - 1);
+              fscanf (fp, fmt_str, buffer1, buffer2, buffer3);
               source->direction.x = g_ascii_strtod (buffer1, &endptr);
               source->direction.y = g_ascii_strtod (buffer2, &endptr);
               source->direction.z = g_ascii_strtod (buffer3, &endptr);
 
-              fscanf (fp, " Color: %s %s %s", buffer1, buffer2, buffer3);
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Color: %%%lds %%%lds %%%lds",
+                        sizeof (buffer1) - 1,
+                        sizeof (buffer2) - 1,
+                        sizeof (buffer3) - 1);
+              fscanf (fp, fmt_str, buffer1, buffer2, buffer3);
               source->color.r = g_ascii_strtod (buffer1, &endptr);
               source->color.g = g_ascii_strtod (buffer2, &endptr);
               source->color.b = g_ascii_strtod (buffer3, &endptr);
               source->color.a = 1.0;
 
-              fscanf (fp, " Intensity: %s", buffer1);
+              snprintf (fmt_str, sizeof (fmt_str),
+                        " Intensity: %%%lds",
+                        sizeof (buffer1) - 1);
+              fscanf (fp, fmt_str, buffer1);
               source->intensity = g_ascii_strtod (buffer1, &endptr);
 
             }