easy: fix connection ownership in curl_easy_pause

Before calling Curl_client_chop_write(), change the owner of connection
to the current Curl_easy handle. This will fix the issue #2217.

Fixes https://github.com/curl/curl/issues/2217
Closes https://github.com/curl/curl/pull/2221

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/easy.c b/lib/easy.c
index 75f332b07..d34887913 100644
--- a/lib/easy.c
+++ b/lib/easy.c
@@ -1045,6 +1045,8 @@ CURLcode curl_easy_pause(struct Curl_easy *data, int action)
     unsigned int i;
     unsigned int count = data->state.tempcount;
     struct tempbuf writebuf[3]; /* there can only be three */
+    struct connectdata *conn = data->easy_conn;
+    struct Curl_easy *saved_data = NULL;
 
     /* copy the structs to allow for immediate re-pausing */
     for(i = 0; i < data->state.tempcount; i++) {
@@ -1053,16 +1055,27 @@ CURLcode curl_easy_pause(struct Curl_easy *data, int action)
     }
     data->state.tempcount = 0;
 
+    /* set the connection's current owner */
+    if(conn->data != data) {
+      saved_data = conn->data;
+      conn->data = data;
+    }
+
     for(i = 0; i < count; i++) {
       /* even if one function returns error, this loops through and frees all
          buffers */
       if(!result)
-        result = Curl_client_chop_write(data->easy_conn,
+        result = Curl_client_chop_write(conn,
                                         writebuf[i].type,
                                         writebuf[i].buf,
                                         writebuf[i].len);
       free(writebuf[i].buf);
     }
+
+    /* recover previous owner of the connection */
+    if(saved_data)
+      conn->data = saved_data;
+
     if(result)
       return result;
   }