commit f8597b424fcdaae15d6f37b626e261994e907f6a
author Maxim Dounin <mdounin@mdounin.ru> Tue Jul 11 16:06:26 2017 +0300
committer Maxim Dounin <mdounin@mdounin.ru> Tue Jul 11 16:06:26 2017 +0300
tree b6a9bc4669d69910788823927183d2abf3f35c52
parent 7e18ca8cc99541acbb614c19ae34a1d7790e3fce

Range filter: avoid negative range start.

Suffix ranges no longer allowed to set negative start values, to prevent
ranges with negative start from appearing even if total size protection
will be removed.

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 ac910fd..292a2b8 100644
--- a/src/http/modules/ngx_http_range_filter_module.c
+++ b/src/http/modules/ngx_http_range_filter_module.c
@@ -355,7 +355,7 @@
         }
 
         if (suffix) {
-            start = content_length - end;
+            start = (end < content_length) ? content_length - end : 0;
             end = content_length - 1;
         }