2 files changed, 3 insertions, 1 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index edd5b29b53c9..1ab33eb71d95 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -188,6 +188,8 @@ struct TCP_Server_Info {
         /* multiplexed reads or writes */
         unsigned int maxBuf;    /* maxBuf specifies the maximum */
         /* message size the server can send or receive for non-raw SMBs */
+        /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
+        /* when socket is setup (and during reconnect) before NegProt sent */
         unsigned int max_rw;    /* maxRw specifies the maximum */
         /* message size the server can send or receive for */
         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 257b6d895e20..10011e99b34d 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -341,7 +341,7 @@ cifs_echo_request(struct work_struct *work)
          * We cannot send an echo until the NEGOTIATE_PROTOCOL request is done.
          * Also, no need to ping if we got a response recently
          */
-        if (server->tcpStatus != CifsGood ||
+        if ((server->tcpStatus != CifsGood) || (server->maxBuf == 0) ||
             time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
                 goto requeue_echo;