Commit 2084ed57 authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Steve French
Browse files

CIFS: Only send SMB2_NEGOTIATE command on new TCP connections 



Do not allow commands other than SMB2_NEGOTIATE to be sent over
recently established TCP connections. Return -EAGAIN to let upper
layers handle it properly.

Signed-off-by: default avatarPavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 6dfbd846

fs/cifs/smb2transport.c

+8 −0
Original line number Diff line number Diff line
@@ -619,6 +619,10 @@ smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr, 
		return -EAGAIN;

	}



	if (ses->server->tcpStatus == CifsNeedNegotiate &&

	   shdr->Command != SMB2_NEGOTIATE)

		return -EAGAIN;



	if (ses->status == CifsNew) {

		if ((shdr->Command != SMB2_SESSION_SETUP) &&

		    (shdr->Command != SMB2_NEGOTIATE))
@@ -702,6 +706,10 @@ smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) 
			(struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;

	struct mid_q_entry *mid;



	if (server->tcpStatus == CifsNeedNegotiate &&

	   shdr->Command != SMB2_NEGOTIATE)

		return ERR_PTR(-EAGAIN);



	smb2_seq_num_into_buf(server, shdr);



	mid = smb2_mid_entry_alloc(shdr, server);