easy: Initialize info variables on easy init and duphandle

- Call Curl_initinfo on init and duphandle.

Prior to this change the statistical and informational variables were
simply zeroed by calloc on easy init and duphandle. While zero is the
correct default value for almost all info variables, there is one where
it isn't (filetime initializes to -1).

Bug: https://github.com/curl/curl/issues/1103
Reported-by: Neal Poole

4 files changed, 11 insertions, 3 deletions

diff --git a/lib/easy.c b/lib/easy.c
index eee1061e8..1242369d5 100644
--- a/lib/easy.c
+++ b/lib/easy.c
@@ -927,6 +927,8 @@ struct Curl_easy *curl_easy_duphandle(struct Curl_easy *data)
 
   Curl_convert_setup(outcurl);
 
+  Curl_initinfo(outcurl);
+
   outcurl->magic = CURLEASY_MAGIC_NUMBER;
 
   /* we reach this point and thus we are OK */
diff --git a/lib/getinfo.c b/lib/getinfo.c
index 9641d79dc..3186d8ac5 100644
--- a/lib/getinfo.c
+++ b/lib/getinfo.c
@@ -36,8 +36,11 @@
 #include "memdebug.h"
 
 /*
- * This is supposed to be called in the beginning of a perform() session and
- * in curl_easy_reset() and should reset all session-info variables.
+ * Initialize statistical and informational data.
+ *
+ * This function is called in curl_easy_reset, curl_easy_duphandle and at the
+ * beginning of a perform session. It must reset the session-info variables,
+ * in particular all variables in struct PureInfo.
  */
 CURLcode Curl_initinfo(struct Curl_easy *data)
 {
diff --git a/lib/url.c b/lib/url.c
index b997f419b..65c2e5414 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -92,6 +92,7 @@ bool curl_win32_idn_to_ascii(const char *in, char **out);
 #include "warnless.h"
 #include "non-ascii.h"
 #include "inet_pton.h"
+#include "getinfo.h"
 
 /* And now for the protocols */
 #include "ftp.h"
@@ -646,6 +647,8 @@ CURLcode Curl_open(struct Curl_easy **curl)
 
     Curl_convert_init(data);
 
+    Curl_initinfo(data);
+
     /* most recent connection is not yet defined */
     data->state.lastconnect = NULL;
 
diff --git a/lib/urldata.h b/lib/urldata.h
index 7c7bf1ba0..938462605 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1105,7 +1105,7 @@ struct connectdata {
 
 /*
  * Struct to keep statistical and informational data.
- * All variables in this struct must be reset in Curl_initinfo().
+ * All variables in this struct must be initialized/reset in Curl_initinfo().
  */
 struct PureInfo {
   int httpcode;  /* Recent HTTP, FTP, RTSP or SMTP response code */