# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1487362190 -10800
# Node ID 180d415c0e5985027b8f651beec98e9a136c570c
# Parent  b676808a49bc65d22a9032d6d8faedf6de676d71
Avoid switching to a range past the last one.

Found with AddressSanitizer.

diff --git a/ngx_http_bytes_filter_module.c b/ngx_http_bytes_filter_module.c
--- a/ngx_http_bytes_filter_module.c
+++ b/ngx_http_bytes_filter_module.c
@@ -543,18 +543,18 @@ fixup:
                            b->pos, b->last);
         }
 
-        if (range->end < ctx->offset + size) {
+        if (range->end < ctx->offset + size
+            && range < last - 1)
+        {
             range++;
-            if (range < last) {
-                ctx->range = range;
+            ctx->range = range;
 
-                if (range->start > ctx->offset + size) {
-                    continue;
-                }
+            if (range->start > ctx->offset + size) {
+                continue;
+            }
 
-                /* next range in same buffer */
-                goto next;
-            }
+            /* next range in same buffer */
+            goto next;
         }
     }