Fixed checking the socket if there is data waiting in the cache

Use Curl_pp_moredata() in Curl_pp_multi_statemach() to check if there is
more data to be received, rather than the socket state, as a task could
hang waiting for more data from the socket itself.

1 files changed, 7 insertions, 3 deletions

diff --git a/lib/pingpong.c b/lib/pingpong.c
index 69834da7d..ec0047109 100644
--- a/lib/pingpong.c
+++ b/lib/pingpong.c
@@ -102,9 +102,13 @@ CURLcode Curl_pp_statemach(struct pingpong *pp, bool block)
   else
     interval_ms = 0; /* immediate */
 
-  rc = Curl_socket_ready(pp->sendleft?CURL_SOCKET_BAD:sock, /* reading */
-                         pp->sendleft?sock:CURL_SOCKET_BAD, /* writing */
-                         interval_ms);
+  if(Curl_pp_moredata(pp))
+    /* We are receiving and there is data in the cache so just read it */
+    rc = 1;
+  else
+    rc = Curl_socket_ready(pp->sendleft?CURL_SOCKET_BAD:sock, /* reading */
+                           pp->sendleft?sock:CURL_SOCKET_BAD, /* writing */
+                           interval_ms);
 
   if(block) {
     /* if we didn't wait, we don't have to spend time on this now */