Created attachment 311138 [details]
NULL checking added in file gdk-pixbuf-scale.c & function header modified for gdk-pixbuf-util.c

In gdk-pixbuf-scale.c file, gdk_pixbuf_rotate_simple() & gdk_pixbuf_flip()
functions are public where user pass the GdkPixbuf *src while calling the functions.
Inside both functions src pointer is derefrenced without being checked for NULL pointer.
Since both are public APIs NULL check should be mandatory.

For gdk-pixbuf-util.c file, function header of gdk_pixbuf_apply_embedded_orientation
is changed since this function can also return NULL value.

Note: Please find the patch for the above mentioned changes in the attachment