File CVE-2021-23017.patch of Package nginx.27554
--- nginx-1.16.1.orig/src/core/ngx_resolver.c 2019-08-13 14:51:43.000000000 +0200 +++ nginx-1.16.1/src/core/ngx_resolver.c 2021-05-20 14:31:44.398749952 +0200 @@ -3927,7 +3927,7 @@ ngx_uint_t i, n; p = src; - len = -1; + len = 0; /* * compression pointers allow to create endless loop, so we set limit; @@ -3970,7 +3970,7 @@ return NGX_OK; } - if (len == -1) { + if (len == 0) { ngx_str_null(name); return NGX_OK; }