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[CIFS] Do not send SMBEcho requests on new sockets until SMBNegotiate

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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;