Fixed Bug #65060 imagecreatefrom... crashes with user streams

Fixed Bug #65084 imagecreatefromjpeg fails with URL

Regression introduced in 8a90aad (drop of USE_GD_IOCTX)
Secure with php_stream_can_cast to avoid segfault in php_stream_cast.
(encountered when imagecreatefromxpm with URL)

NEWS

@@ -8,6 +8,8 @@ PHP                                                                        NEWS
 - GD
   . Fixed #65070 (bgcolor does not use the same format as the input image with
     imagerotate). (Pierre)
+  . Fixed Bug #65060 (imagecreatefrom... crashes with user streams). (Remi)
+  . Fixed Bug #65084 (imagecreatefromjpeg fails with URL). (Remi)
 
 20 Jun 2013, PHP 5.5.0
 

ext/gd/gd.c

@@ -2361,13 +2361,12 @@ static void _php_image_create_from(INTERNAL_FUNCTION_PARAMETERS, int image_type,
 		}
 	}
 
+
 	stream = php_stream_open_wrapper(file, "rb", REPORT_ERRORS|IGNORE_PATH|IGNORE_URL_WIN, NULL);
 	if (stream == NULL)	{
 		RETURN_FALSE;
 	}
 
-	ioctx_func_p = NULL; /* don't allow sockets without IOCtx */
-
 	if (image_type == PHP_GDIMG_TYPE_WEBP) {
 		size_t buff_size;
 		char *buff;
@@ -2419,7 +2418,7 @@ static void _php_image_create_from(INTERNAL_FUNCTION_PARAMETERS, int image_type,
 		io_ctx->gd_free(io_ctx);
 		pefree(buff, 1);
 	}
-	else {
+	else if (php_stream_can_cast(stream, PHP_STREAM_AS_STDIO)) {
 		/* try and force the stream to be FILE* */
 		if (FAILURE == php_stream_cast(stream, PHP_STREAM_AS_STDIO | PHP_STREAM_CAST_TRY_HARD, (void **) &fp, REPORT_ERRORS)) {
 			goto out_err;