*) fix of r4060: start value should be tested after the "found" label;
*) optimization: start value may be tested against end value only,
   since end value here may not be greater than content_length.

src/http/modules/ngx_http_range_filter_module.c

diff --git a/src/http/modules/ngx_http_range_filter_module.c b/src/http/modules/ngx_http_range_filter_module.c
index 55a37d4..3e416b3 100644
--- a/src/http/modules/ngx_http_range_filter_module.c
+++ b/src/http/modules/ngx_http_range_filter_module.c
@@ -295,10 +295,6 @@
             end = content_length - 1;
         }
 
-        if (start >= content_length || start > end) {
-            goto skip;
-        }
-
         if (end >= content_length) {
             end = content_length;
 
@@ -308,18 +304,18 @@
 
     found:
 
-        range = ngx_array_push(&ctx->ranges);
-        if (range == NULL) {
-            return NGX_ERROR;
+        if (start < end) {
+	    range = ngx_array_push(&ctx->ranges);
+	    if (range == NULL) {
+		return NGX_ERROR;
+	    }
+
+	    range->start = start;
+	    range->end = end;
+
+	    size += end - start;
         }
 
-        range->start = start;
-        range->end = end;
-
-        size += end - start;
-
-    skip:
-
         if (*p++ != ',') {
             break;
         }