test finalized image filter context before testing image_filter off
this fixes SIGFPE if image filter errors are passed to named location
diff --git a/src/http/modules/ngx_http_image_filter_module.c b/src/http/modules/ngx_http_image_filter_module.c
index 83fc145..fd20550 100644
--- a/src/http/modules/ngx_http_image_filter_module.c
+++ b/src/http/modules/ngx_http_image_filter_module.c
@@ -162,6 +162,13 @@
return ngx_http_next_header_filter(r);
}
+ ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
+
+ if (ctx) {
+ ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module);
+ return ngx_http_next_header_filter(r);
+ }
+
conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
if (conf->filter == NGX_HTTP_IMAGE_OFF) {
@@ -181,13 +188,6 @@
return NGX_ERROR;
}
- ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
-
- if (ctx) {
- ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module);
- return ngx_http_next_header_filter(r);
- }
-
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
