curl: Heap-use-after-free in CURLOPT_REFERER when passed a CURLINFO_REFERER pointer

Summary Setting CURLOPTREFERER with a pointer previously obtained from CURLINFOREFERER on the same easy handle triggers a heap-use-after-free. The CURLOPTREFERER handler frees data-state.referer line lib/setopt.c:2089 before Curlsetstropt reads from the now-dangling pointer line...