4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 0fd1d37b0501efc6e295f56ab55cdaff784aa50c ]
If we don't receive a response we can't assume that the server granted one credit. Assume zero credits in such cases.
Signed-off-by: Pavel Shilovsky pshilov@microsoft.com Reviewed-by: Ronnie Sahlberg lsahlber@redhat.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/cifs/smb2pdu.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 8a01e89ff827..1e5a1171212f 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -2814,9 +2814,10 @@ smb2_echo_callback(struct mid_q_entry *mid) { struct TCP_Server_Info *server = mid->callback_data; struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf; - unsigned int credits_received = 1; + unsigned int credits_received = 0;
- if (mid->mid_state == MID_RESPONSE_RECEIVED) + if (mid->mid_state == MID_RESPONSE_RECEIVED + || mid->mid_state == MID_RESPONSE_MALFORMED) credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
DeleteMidQEntry(mid); @@ -3073,7 +3074,7 @@ smb2_readv_callback(struct mid_q_entry *mid) struct TCP_Server_Info *server = tcon->ses->server; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)rdata->iov[0].iov_base; - unsigned int credits_received = 1; + unsigned int credits_received = 0; struct smb_rqst rqst = { .rq_iov = rdata->iov, .rq_nvec = 2, .rq_pages = rdata->pages, @@ -3112,6 +3113,9 @@ smb2_readv_callback(struct mid_q_entry *mid) task_io_account_read(rdata->got_bytes); cifs_stats_bytes_read(tcon, rdata->got_bytes); break; + case MID_RESPONSE_MALFORMED: + credits_received = le16_to_cpu(shdr->CreditRequest); + /* fall through */ default: if (rdata->result != -ENODATA) rdata->result = -EIO; @@ -3305,7 +3309,7 @@ smb2_writev_callback(struct mid_q_entry *mid) struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); unsigned int written; struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; - unsigned int credits_received = 1; + unsigned int credits_received = 0;
switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: @@ -3333,6 +3337,9 @@ smb2_writev_callback(struct mid_q_entry *mid) case MID_RETRY_NEEDED: wdata->result = -EAGAIN; break; + case MID_RESPONSE_MALFORMED: + credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest); + /* fall through */ default: wdata->result = -EIO; break;