rustls: verify that verifier_builder is not NULL

Since this function returns allocated resources there is probably at
least a theoretical risk this can return NULL.

Pointed out by ZeroPath

Closes #19756

diff --git a/lib/vtls/rustls.c b/lib/vtls/rustls.c
index e4251a915198085076afc7b6fb8eb10760b4325d..0c13cc81eebb9944399a2ad5f8176ba4d3908ff5 100644 (file)
--- a/lib/vtls/rustls.c
+++ b/lib/vtls/rustls.c
@@ -750,6 +750,10 @@ init_config_builder_verifier(struct Curl_easy *data,
   }
 
   verifier_builder = rustls_web_pki_server_cert_verifier_builder_new(roots);
+  if(!verifier_builder) {
+    result = CURLE_OUT_OF_MEMORY;
+    goto cleanup;
+  }
 
   if(conn_config->CRLfile) {
     result = init_config_builder_verifier_crl(data,