From 3d3003fce8e837acc4e3960fe3cbabebc356dcb5 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Tue, 22 Jan 2019 16:50:21 -0800 Subject: [PATCH] CIFS: Fix credit calculations in compound mid callback The current code doesn't do proper accounting for credits in SMB1 case: it adds one credit per response only if we get a complete response while it needs to return it unconditionally. Fix this and also include malformed responses for SMB2+ into accounting for credits because such responses have Credit Granted field, thus nothing prevents to get a proper credit value from them. Signed-off-by: Pavel Shilovsky Reviewed-by: Ronnie Sahlberg Signed-off-by: Steve French --- fs/cifs/smb2ops.c | 6 +++++- fs/cifs/transport.c | 11 +---------- 2 files changed, 6 insertions(+), 11 deletions(-) diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 73f9c6af4065..153238fc4fa9 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -154,7 +154,11 @@ smb2_get_credits(struct mid_q_entry *mid) { struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf; - return le16_to_cpu(shdr->CreditRequest); + if (mid->mid_state == MID_RESPONSE_RECEIVED + || mid->mid_state == MID_RESPONSE_MALFORMED) + return le16_to_cpu(shdr->CreditRequest); + + return 0; } static int diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 202e0e84efdd..53532bd3f50d 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -786,17 +786,8 @@ static void cifs_compound_callback(struct mid_q_entry *mid) { struct TCP_Server_Info *server = mid->server; - unsigned int optype = mid->optype; - unsigned int credits_received = 0; - if (mid->mid_state == MID_RESPONSE_RECEIVED) { - if (mid->resp_buf) - credits_received = server->ops->get_credits(mid); - else - cifs_dbg(FYI, "Bad state for cancelled MID\n"); - } - - add_credits(server, credits_received, optype); + add_credits(server, server->ops->get_credits(mid), mid->optype); } static void -- 2.30.2