From 7e90d705fc9f8c5e3a1549281dce0654d049243b Mon Sep 17 00:00:00 2001 From: Steve French Date: Tue, 8 Feb 2011 23:52:32 +0000 Subject: [PATCH] [CIFS] Do not send SMBEcho requests on new sockets until SMBNegotiate In order to determine whether an SMBEcho request can be sent we need to know that the socket is established (server tcpStatus == CifsGood) AND that an SMB NegotiateProtocol has been sent (server maxBuf != 0). Without the second check we can send an Echo request during reconnection before the server can accept it. CC: JG Reviewed-by: Jeff Layton Signed-off-by: Steve French --- fs/cifs/cifsglob.h | 2 ++ fs/cifs/connect.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) 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; -- 2.20.1