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Date: Mon, 7 Mar 2016 16:02:39 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Pavel Shilovsky <pshilovsky@...ba.org>, Shirish Pargaonkar <shirishpargaonkar@...il.com>, Steve French <smfrench@...il.com> Subject: [PATCH 4.4 14/74] CIFS: Fix SMB2+ interim response processing for read requests 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pavel Shilovsky <pshilovsky@...ba.org> commit 6cc3b24235929b54acd5ecc987ef11a425bd209e upstream. For interim responses we only need to parse a header and update a number credits. Now it is done for all SMB2+ command except SMB2_READ which is wrong. Fix this by adding such processing. Signed-off-by: Pavel Shilovsky <pshilovsky@...ba.org> Tested-by: Shirish Pargaonkar <shirishpargaonkar@...il.com> Signed-off-by: Steve French <smfrench@...il.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- fs/cifs/cifssmb.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1396,11 +1396,10 @@ openRetry: * current bigbuf. */ static int -cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid) +discard_remaining_data(struct TCP_Server_Info *server) { unsigned int rfclen = get_rfc1002_length(server->smallbuf); int remaining = rfclen + 4 - server->total_read; - struct cifs_readdata *rdata = mid->callback_data; while (remaining > 0) { int length; @@ -1414,10 +1413,20 @@ cifs_readv_discard(struct TCP_Server_Inf remaining -= length; } - dequeue_mid(mid, rdata->result); return 0; } +static int +cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid) +{ + int length; + struct cifs_readdata *rdata = mid->callback_data; + + length = discard_remaining_data(server); + dequeue_mid(mid, rdata->result); + return length; +} + int cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid) { @@ -1446,6 +1455,12 @@ cifs_readv_receive(struct TCP_Server_Inf return length; server->total_read += length; + if (server->ops->is_status_pending && + server->ops->is_status_pending(buf, server, 0)) { + discard_remaining_data(server); + return -1; + } + /* Was the SMB read successful? */ rdata->result = server->ops->map_error(buf, false); if (rdata->result != 0) {
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