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[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 <jg@cms.ac>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2011-02-08 23:52:32 +00:00
parent 100b33c8bd
commit 7e90d705fc
2 changed files with 3 additions and 1 deletions
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2
fs/cifs/cifsglob.h
View File

@ -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. */

2
fs/cifs/connect.c
View File

@ -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;