# HG changeset patch
# User Ruslan Ermilov <ru@nginx.com>
# Date 1356533166 0
# Node ID 82336a9ce26d340c145e5c8c47c41a1f6d5b9e77
# Parent  5d1d3b2acb1d724d051295a4707391d55b19ce46
Upstream keepalive: detect duplicate "keepalive" directive.

A failure to detect duplicate "keepalive" directive resulted in
stack exhaustion.

diff --git a/src/http/modules/ngx_http_upstream_keepalive_module.c b/src/http/modules/ngx_http_upstream_keepalive_module.c
--- a/src/http/modules/ngx_http_upstream_keepalive_module.c
+++ b/src/http/modules/ngx_http_upstream_keepalive_module.c
@@ -502,6 +502,10 @@ ngx_http_upstream_keepalive(ngx_conf_t *
     kcf = ngx_http_conf_upstream_srv_conf(uscf,
                                           ngx_http_upstream_keepalive_module);
 
+    if (kcf->original_init_upstream) {
+        return "is duplicate";
+    }
+
     kcf->original_init_upstream = uscf->peer.init_upstream
                                   ? uscf->peer.init_upstream
                                   : ngx_http_upstream_init_round_robin;