curl_multi_add_handle/easy_perform: clear errorbuffer if set

To offer applications a more defined behavior, we clear the buffer as
early as possible.

Bug #2190

2 files changed, 6 insertions, 0 deletions

diff --git a/lib/easy.c b/lib/easy.c
index 64c647be2..34c17c6b6 100644
--- a/lib/easy.c
+++ b/lib/easy.c
@@ -743,6 +743,10 @@ static CURLcode easy_perform(struct Curl_easy *data, bool events)
   CURLcode result = CURLE_OK;
   SIGPIPE_VARIABLE(pipe_st);
 
+  if(data->set.errorbuffer)
+    /* clear this as early as possible */
+    data->set.errorbuffer[0] = 0;
+
   if(!data)
     return CURLE_BAD_FUNCTION_ARGUMENT;
 
diff --git a/lib/multi.c b/lib/multi.c
index 98e5fca2a..671f4597e 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -378,6 +378,8 @@ CURLMcode curl_multi_add_handle(struct Curl_multi *multi,
    * potential multi's connection cache growing which won't be undone in this
    * function no matter what.
    */
+  if(data->set.errorbuffer)
+    data->set.errorbuffer[0] = 0;
 
   /* set the easy handle */
   multistate(data, CURLM_STATE_INIT);