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CIFS: Only send SMB2_NEGOTIATE command on new TCP connections

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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: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Pavel Shilovsky 2019-03-05 15:51:55 -08:00 committed by Steve French
parent 6dfbd84684
commit 2084ed5716
1 changed files with 8 additions and 0 deletions
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8
fs/cifs/smb2transport.c
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@ -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);