[librsvg] Fix crash when rendering style only file.

[Hiroyuki Ikezoe <hiikezoe src gnome org>]

commit a55aa23ca95c749821c44c3d705adad0258305d9
Author: Hiroyuki Ikezoe <hiikezoe gnome org>
Date:   Wed Jun 2 20:13:19 2010 +0900

    Fix crash when rendering style only file.
    
    Fix for bug #620238.

 rsvg-base.c                        |    2 +-
 tests/Makefile.am                  |    1 +
 tests/crash.c                      |   52 ++++++++++++++++++++++++++++++++++++
 tests/fixtures/crash/bug620238.svg |    1 +
 4 files changed, 55 insertions(+), 1 deletions(-)
---
diff --git a/rsvg-base.c b/rsvg-base.c
index c4b2027..71ed7a9 100644
--- a/rsvg-base.c
+++ b/rsvg-base.c
@@ -690,7 +690,7 @@ rsvg_end_element (void *data, const xmlChar * name)
             && !strcmp ((const char *) name, ctx->priv->currentnode->type->str))
             rsvg_pop_def_group (ctx);
 
-        if (!strcmp ((const char *)name, "style"))
+        if (ctx->priv->treebase && !strcmp ((const char *)name, "style"))
             _rsvg_node_svg_apply_atts ((RsvgNodeSvg *)ctx->priv->treebase, ctx);
     }
 }
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 87f388b..9ce473f 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -2,6 +2,7 @@ SUBDIRS=pdiff .
 
 TESTS = 		\
 	rsvg-test	\
+	crash		\
 	dimensions	\
 	styles
 
diff --git a/tests/crash.c b/tests/crash.c
new file mode 100644
index 0000000..aa5c1a9
--- /dev/null
+++ b/tests/crash.c
@@ -0,0 +1,52 @@
+/* vim: set ts=4 nowrap ai expandtab sw=4: */
+
+#include <glib.h>
+#include "rsvg.h"
+#include "test-utils.h"
+
+typedef struct _FixtureData
+{
+    const gchar *test_name;
+    const gchar *file_path;
+} FixtureData;
+
+static void
+test_crash (FixtureData *fixture)
+{
+    RsvgHandle *handle;
+    gchar *target_file;
+    GError *error = NULL;
+
+    target_file = g_build_filename (test_utils_get_test_data_path (),
+                                    fixture->file_path, NULL);
+    handle = rsvg_handle_new_from_file (target_file, &error);
+    g_free (target_file);
+    g_assert_no_error (error);
+
+    g_object_unref (handle);
+}
+
+static FixtureData fixtures[] =
+{
+    {"/crash/only style information", "crash/bug620238.svg"}
+};
+
+static const gint n_fixtures = G_N_ELEMENTS (fixtures);
+
+int
+main (int argc, char *argv[])
+{
+    gint i;
+    int result;
+
+    rsvg_init ();
+    g_test_init (&argc, &argv, NULL);
+
+    for (i = 0; i < n_fixtures; i++)
+        g_test_add_data_func (fixtures[i].test_name, &fixtures[i], (void*)test_crash);
+
+    result = g_test_run ();
+    rsvg_term ();
+
+    return result;
+}
diff --git a/tests/fixtures/crash/bug620238.svg b/tests/fixtures/crash/bug620238.svg
new file mode 100644
index 0000000..ac9c811
--- /dev/null
+++ b/tests/fixtures/crash/bug620238.svg
@@ -0,0 +1 @@
+<style type="text/css"> </style>