Variables: fixed non-indexed access of prefix vars (ticket #600).
Previously, a configuration like
location / {
ssi on;
ssi_types *;
set $http_foo "bar";
return 200 '<!--#echo var="http_foo" -->\n';
}
resulted in NULL pointer dereference in ngx_http_get_variable() as
the variable was explicitly added to the variables hash, but its
get_handler wasn't properly set in the hash. Fix is to make sure
that get_handler is properly set by ngx_http_variables_init_vars().
diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index 1b61c39..738f223 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -2511,8 +2511,7 @@
av = key[n].value;
- if (av->get_handler
- && v[i].name.len == key[n].key.len
+ if (v[i].name.len == key[n].key.len
&& ngx_strncmp(v[i].name.data, key[n].key.data, v[i].name.len)
== 0)
{
@@ -2524,6 +2523,10 @@
av->index = i;
+ if (av->get_handler == NULL) {
+ break;
+ }
+
goto next;
}
}
