http_aws_sigv4: check the return value of curl_maprintf()

Closes #9328

diff --git a/lib/http_aws_sigv4.c b/lib/http_aws_sigv4.c
index f592f3844feba99716c1afa6997e41c520a1435d..bb88a0f8ce7bf4f7452f7f234525cc9f3752f370 100644 (file)
--- a/lib/http_aws_sigv4.c
+++ b/lib/http_aws_sigv4.c
@@ -329,6 +329,8 @@ static CURLcode make_headers(struct Curl_easy *data,
       goto fail;
     head = tmp_head;
     *date_header = curl_maprintf("%s: %s\r\n", date_hdr_key, timestamp);
+    if(!*date_header)
+      goto fail;
   }
   else {
     const char *value;