diff --git a/.hgtags b/.hgtags
index 04a512b..8e059a3 100644
--- a/.hgtags
+++ b/.hgtags
@@ -432,3 +432,4 @@ b234199c7ed8a156a6bb98f7ff58302c857c954f release-1.15.2
 49d49835653857daa418e68d6cbfed4958c78fca release-1.15.4
 f062e43d74fc2578bb100a9e82a953efa1eb9e4e release-1.15.5
 2351853ce6867b6166823bdf94333c0a76633c0a release-1.15.6
+051a039ce1c7e09144de4a4846669ec7116cecea release-1.15.7
diff --git a/docs/xml/nginx/changes.xml b/docs/xml/nginx/changes.xml
index 43a21e5..0738e6f 100644
--- a/docs/xml/nginx/changes.xml
+++ b/docs/xml/nginx/changes.xml
@@ -5,6 +5,62 @@
 <change_log title="nginx">
 
 
+<changes ver="1.15.7" date="2018-11-27">
+
+<change type="feature">
+<para lang="ru">
+директива proxy_requests в модуле stream.
+</para>
+<para lang="en">
+the "proxy_requests" directive in the stream module.
+</para>
+</change>
+
+<change type="feature">
+<para lang="ru">
+параметр "delay" директивы "limit_req".<br/>
+Спасибо Владиславу Шабанову и Петру Щучкину.
+</para>
+<para lang="en">
+the "delay" parameter of the "limit_req" directive.<br/>
+Thanks to Vladislav Shabanov and Peter Shchuchkin.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+утечки памяти в случае ошибок при переконфигурации.
+</para>
+<para lang="en">
+memory leak on errors during reconfiguration.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+в переменных $upstream_response_time, $upstream_connect_time и
+$upstream_header_time.
+</para>
+<para lang="en">
+in the $upstream_response_time, $upstream_connect_time, and
+$upstream_header_time variables.
+</para>
+</change>
+
+<change type="bugfix">
+<para lang="ru">
+в рабочем процессе мог произойти segmentation fault,
+если использовался модуль ngx_http_mp4_module на 32-битных платформах.
+</para>
+<para lang="en">
+a segmentation fault might occur in a worker process
+if the ngx_http_mp4_module was used on 32-bit platforms.
+</para>
+</change>
+
+</changes>
+
+
 <changes ver="1.15.6" date="2018-11-06">
 
 <change type="security">
diff --git a/misc/GNUmakefile b/misc/GNUmakefile
index 73d8bd9..d68ceca 100644
--- a/misc/GNUmakefile
+++ b/misc/GNUmakefile
@@ -6,7 +6,7 @@ TEMP =		tmp
 
 CC =		cl
 OBJS =		objs.msvc8
-OPENSSL =	openssl-1.0.2p
+OPENSSL =	openssl-1.0.2q
 ZLIB =		zlib-1.2.11
 PCRE =		pcre-8.42
 
diff --git a/src/core/nginx.h b/src/core/nginx.h
index 6e14020..63934f1 100644
--- a/src/core/nginx.h
+++ b/src/core/nginx.h
@@ -9,8 +9,8 @@
 #define _NGINX_H_INCLUDED_
 
 
-#define nginx_version      1015007
-#define NGINX_VERSION      "1.15.7"
+#define nginx_version      1015008
+#define NGINX_VERSION      "1.15.8"
 #define NGINX_VER          "nginx/" NGINX_VERSION " by Hakase"
 
 #ifndef NGINX_SERVER
diff --git a/src/core/ngx_output_chain.c b/src/core/ngx_output_chain.c
index 7f5dc78..5c3dbe8 100644
--- a/src/core/ngx_output_chain.c
+++ b/src/core/ngx_output_chain.c
@@ -126,6 +126,26 @@ ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
                 continue;
             }
 
+            if (bsize < 0) {
+
+                ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
+                              "negative size buf in output "
+                              "t:%d r:%d f:%d %p %p-%p %p %O-%O",
+                              ctx->in->buf->temporary,
+                              ctx->in->buf->recycled,
+                              ctx->in->buf->in_file,
+                              ctx->in->buf->start,
+                              ctx->in->buf->pos,
+                              ctx->in->buf->last,
+                              ctx->in->buf->file,
+                              ctx->in->buf->file_pos,
+                              ctx->in->buf->file_last);
+
+                ngx_debug_point();
+
+                return NGX_ERROR;
+            }
+
             if (ngx_output_chain_as_is(ctx, ctx->in->buf)) {
 
                 /* move the chain link to the output chain */
@@ -665,7 +685,6 @@ ngx_chain_writer(void *data, ngx_chain_t *in)
 
     for (size = 0; in; in = in->next) {
 
-#if 1
         if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
 
             ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
@@ -685,7 +704,26 @@ ngx_chain_writer(void *data, ngx_chain_t *in)
 
             continue;
         }
-#endif
+
+        if (ngx_buf_size(in->buf) < 0) {
+
+            ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
+                          "negative size buf in chain writer "
+                          "t:%d r:%d f:%d %p %p-%p %p %O-%O",
+                          in->buf->temporary,
+                          in->buf->recycled,
+                          in->buf->in_file,
+                          in->buf->start,
+                          in->buf->pos,
+                          in->buf->last,
+                          in->buf->file,
+                          in->buf->file_pos,
+                          in->buf->file_last);
+
+            ngx_debug_point();
+
+            return NGX_ERROR;
+        }
 
         size += ngx_buf_size(in->buf);
 
@@ -709,7 +747,6 @@ ngx_chain_writer(void *data, ngx_chain_t *in)
 
     for (cl = ctx->out; cl; cl = cl->next) {
 
-#if 1
         if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
 
             ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
@@ -729,7 +766,26 @@ ngx_chain_writer(void *data, ngx_chain_t *in)
 
             continue;
         }
-#endif
+
+        if (ngx_buf_size(cl->buf) < 0) {
+
+            ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
+                          "negative size buf in chain writer "
+                          "t:%d r:%d f:%d %p %p-%p %p %O-%O",
+                          cl->buf->temporary,
+                          cl->buf->recycled,
+                          cl->buf->in_file,
+                          cl->buf->start,
+                          cl->buf->pos,
+                          cl->buf->last,
+                          cl->buf->file,
+                          cl->buf->file_pos,
+                          cl->buf->file_last);
+
+            ngx_debug_point();
+
+            return NGX_ERROR;
+        }
 
         size += ngx_buf_size(cl->buf);
     }
diff --git a/src/http/ngx_http_write_filter_module.c b/src/http/ngx_http_write_filter_module.c
index 0036231..3f18d76 100644
--- a/src/http/ngx_http_write_filter_module.c
+++ b/src/http/ngx_http_write_filter_module.c
@@ -80,7 +80,6 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
                        cl->buf->file_pos,
                        cl->buf->file_last - cl->buf->file_pos);
 
-#if 1
         if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
             ngx_log_error(NGX_LOG_ALERT, c->log, 0,
                           "zero size buf in writer "
@@ -98,7 +97,24 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
             ngx_debug_point();
             return NGX_ERROR;
         }
-#endif
+
+        if (ngx_buf_size(cl->buf) < 0) {
+            ngx_log_error(NGX_LOG_ALERT, c->log, 0,
+                          "negative size buf in writer "
+                          "t:%d r:%d f:%d %p %p-%p %p %O-%O",
+                          cl->buf->temporary,
+                          cl->buf->recycled,
+                          cl->buf->in_file,
+                          cl->buf->start,
+                          cl->buf->pos,
+                          cl->buf->last,
+                          cl->buf->file,
+                          cl->buf->file_pos,
+                          cl->buf->file_last);
+
+            ngx_debug_point();
+            return NGX_ERROR;
+        }
 
         size += ngx_buf_size(cl->buf);
 
@@ -136,7 +152,6 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
                        cl->buf->file_pos,
                        cl->buf->file_last - cl->buf->file_pos);
 
-#if 1
         if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
             ngx_log_error(NGX_LOG_ALERT, c->log, 0,
                           "zero size buf in writer "
@@ -154,7 +169,24 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
             ngx_debug_point();
             return NGX_ERROR;
         }
-#endif
+
+        if (ngx_buf_size(cl->buf) < 0) {
+            ngx_log_error(NGX_LOG_ALERT, c->log, 0,
+                          "negative size buf in writer "
+                          "t:%d r:%d f:%d %p %p-%p %p %O-%O",
+                          cl->buf->temporary,
+                          cl->buf->recycled,
+                          cl->buf->in_file,
+                          cl->buf->start,
+                          cl->buf->pos,
+                          cl->buf->last,
+                          cl->buf->file,
+                          cl->buf->file_pos,
+                          cl->buf->file_last);
+
+            ngx_debug_point();
+            return NGX_ERROR;
+        }
 
         size += ngx_buf_size(cl->buf);
 
diff --git a/src/stream/ngx_stream_write_filter_module.c b/src/stream/ngx_stream_write_filter_module.c
index 8fdcd37..24326c6 100644
--- a/src/stream/ngx_stream_write_filter_module.c
+++ b/src/stream/ngx_stream_write_filter_module.c
@@ -104,7 +104,6 @@ ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in,
                        cl->buf->file_pos,
                        cl->buf->file_last - cl->buf->file_pos);
 
-#if 1
         if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
             ngx_log_error(NGX_LOG_ALERT, c->log, 0,
                           "zero size buf in writer "
@@ -122,7 +121,24 @@ ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in,
             ngx_debug_point();
             return NGX_ERROR;
         }
-#endif
+
+        if (ngx_buf_size(cl->buf) < 0) {
+            ngx_log_error(NGX_LOG_ALERT, c->log, 0,
+                          "negative size buf in writer "
+                          "t:%d r:%d f:%d %p %p-%p %p %O-%O",
+                          cl->buf->temporary,
+                          cl->buf->recycled,
+                          cl->buf->in_file,
+                          cl->buf->start,
+                          cl->buf->pos,
+                          cl->buf->last,
+                          cl->buf->file,
+                          cl->buf->file_pos,
+                          cl->buf->file_last);
+
+            ngx_debug_point();
+            return NGX_ERROR;
+        }
 
         size += ngx_buf_size(cl->buf);
 
@@ -160,7 +176,6 @@ ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in,
                        cl->buf->file_pos,
                        cl->buf->file_last - cl->buf->file_pos);
 
-#if 1
         if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
             ngx_log_error(NGX_LOG_ALERT, c->log, 0,
                           "zero size buf in writer "
@@ -178,7 +193,24 @@ ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in,
             ngx_debug_point();
             return NGX_ERROR;
         }
-#endif
+
+        if (ngx_buf_size(cl->buf) < 0) {
+            ngx_log_error(NGX_LOG_ALERT, c->log, 0,
+                          "negative size buf in writer "
+                          "t:%d r:%d f:%d %p %p-%p %p %O-%O",
+                          cl->buf->temporary,
+                          cl->buf->recycled,
+                          cl->buf->in_file,
+                          cl->buf->start,
+                          cl->buf->pos,
+                          cl->buf->last,
+                          cl->buf->file,
+                          cl->buf->file_pos,
+                          cl->buf->file_last);
+
+            ngx_debug_point();
+            return NGX_ERROR;
+        }
 
         size += ngx_buf_size(cl->buf);