[nginx] Fixed possible buffer overrun in "too long header line" ...

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/21043ce2a005
branches:  
changeset: 5871:21043ce2a005
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Wed Oct 08 17:16:04 2014 +0400
description:
Fixed possible buffer overrun in "too long header line" logging.

Additionally, ellipsis now always added to make it clear that
the header logged is incomplete.

Reported by Daniil Bondarev.

diffstat:

 src/http/ngx_http_request.c |  5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diffs (18 lines):

diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -1227,12 +1227,11 @@ ngx_http_process_request_headers(ngx_eve
 
                     if (len > NGX_MAX_ERROR_STR - 300) {
                         len = NGX_MAX_ERROR_STR - 300;
-                        p[len++] = '.'; p[len++] = '.'; p[len++] = '.';
                     }
 
                     ngx_log_error(NGX_LOG_INFO, c->log, 0,
-                                  "client sent too long header line: \"%*s\"",
-                                  len, r->header_name_start);
+                                "client sent too long header line: \"%*s...\"",
+                                len, r->header_name_start);
 
                     ngx_http_finalize_request(r,
                                             NGX_HTTP_REQUEST_HEADER_TOO_LARGE);