Missing call to curl_easy_cleanup (--enable-online-update=mar)

<https://curl.haxx.se/libcurl/c/curl_easy_init.html> states that each call to
curl_easy_init "MUST have a corresponding call to curl_easy_cleanup".  (And
<https://curl.haxx.se/libcurl/c/curl_easy_cleanup.html> states:  "Passing in a
NULL pointer in handle will make this function return immediately with no
action.")

The call to curl_easy_cleanup appears to be missing ever since the code calling
curl_easy_init was introduced with 9c3b05f2d571b58ee2322a942162ecec654544dc
"improve update checker and update downloader code".

Change-Id: I5757efe131f73783c6f66a77d07676b8ce440f9d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/104711
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 16 insertions, 13 deletions

diff --git a/desktop/source/app/updater.cxx b/desktop/source/app/updater.cxx
index 2d99856b2174..2748373e5f62 100644
--- a/desktop/source/app/updater.cxx
+++ b/desktop/source/app/updater.cxx
@@ -43,6 +43,8 @@
 
 #include <officecfg/Setup.hxx>
 
+#include <functional>
+#include <memory>
 #include <set>
 
 namespace {
@@ -538,13 +540,14 @@ size_t WriteCallbackFile(void *ptr, size_t size,
 std::string download_content(const OString& rURL, bool bFile, OUString& rHash)
 {
     Updater::log("Download: " + rURL);
-    CURL* curl = curl_easy_init();
+    std::unique_ptr<CURL, std::function<void(CURL *)>> curl(
+        curl_easy_init(), [](CURL * p) { curl_easy_cleanup(p); });
 
     if (!curl)
         return std::string();
 
-    curl_easy_setopt(curl, CURLOPT_URL, rURL.getStr());
-    curl_easy_setopt(curl, CURLOPT_USERAGENT, kUserAgent);
+    curl_easy_setopt(curl.get(), CURLOPT_URL, rURL.getStr());
+    curl_easy_setopt(curl.get(), CURLOPT_USERAGENT, kUserAgent);
     bool bUseProxy = false;
     if (bUseProxy)
     {
@@ -557,18 +560,18 @@ std::string download_content(const OString& rURL, bool bFile, OUString& rHash)
     char buf[] = "Expect:";
     curl_slist* headerlist = nullptr;
     headerlist = curl_slist_append(headerlist, buf);
-    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
-    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1); // follow redirects
+    curl_easy_setopt(curl.get(), CURLOPT_HTTPHEADER, headerlist);
+    curl_easy_setopt(curl.get(), CURLOPT_FOLLOWLOCATION, 1); // follow redirects
     // only allow redirect to http:// and https://
-    curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
+    curl_easy_setopt(curl.get(), CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
 
     std::string response_body;
     utl::TempFile aTempFile;
     WriteDataFile aFile(aTempFile.GetStream(StreamMode::WRITE));
     if (!bFile)
     {
-        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
-        curl_easy_setopt(curl, CURLOPT_WRITEDATA,
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, WriteCallback);
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA,
                 static_cast<void *>(&response_body));
 
         aTempFile.EnableKillingFile(true);
@@ -581,17 +584,17 @@ std::string download_content(const OString& rURL, bool bFile, OUString& rHash)
 
         aTempFile.EnableKillingFile(false);
 
-        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallbackFile);
-        curl_easy_setopt(curl, CURLOPT_WRITEDATA,
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, WriteCallbackFile);
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA,
                 static_cast<void *>(&aFile));
     }
 
     // Fail if 400+ is returned from the web server.
-    curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
+    curl_easy_setopt(curl.get(), CURLOPT_FAILONERROR, 1);
 
-    CURLcode cc = curl_easy_perform(curl);
+    CURLcode cc = curl_easy_perform(curl.get());
     long http_code = 0;
-    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
+    curl_easy_getinfo(curl.get(), CURLINFO_RESPONSE_CODE, &http_code);
     if (http_code != 200)
     {
         SAL_WARN("desktop.updater", "download did not succeed. Error code: " << http_code);