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Message-Id: <20191104212139.466501121@linuxfoundation.org>
Date: Mon, 4 Nov 2019 22:44:01 +0100
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 <pshilov@...rosoft.com>,
Steve French <stfrench@...rosoft.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 048/149] CIFS: Respect SMB2 hdr preamble size in read responses
From: Pavel Shilovsky <pshilov@...rosoft.com>
[ Upstream commit bb1bccb60c2ebd9a6f895507d1d48d5ed773814e ]
There are a couple places where we still account for 4 bytes
in the beginning of SMB2 packet which is not true in the current
code. Fix this to use a header preamble size where possible.
Signed-off-by: Pavel Shilovsky <pshilov@...rosoft.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/cifs/cifssmb.c | 7 ++++---
fs/cifs/smb2ops.c | 6 +++---
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 86a54b809c484..8b9471904f67e 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1521,9 +1521,10 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
/* set up first two iov for signature check and to get credits */
rdata->iov[0].iov_base = buf;
- rdata->iov[0].iov_len = 4;
- rdata->iov[1].iov_base = buf + 4;
- rdata->iov[1].iov_len = server->total_read - 4;
+ rdata->iov[0].iov_len = server->vals->header_preamble_size;
+ rdata->iov[1].iov_base = buf + server->vals->header_preamble_size;
+ rdata->iov[1].iov_len =
+ server->total_read - server->vals->header_preamble_size;
cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
rdata->iov[0].iov_base, rdata->iov[0].iov_len);
cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index f0d966da7f378..6fc16329ceb45 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3000,10 +3000,10 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
/* set up first two iov to get credits */
rdata->iov[0].iov_base = buf;
- rdata->iov[0].iov_len = 4;
- rdata->iov[1].iov_base = buf + 4;
+ rdata->iov[0].iov_len = 0;
+ rdata->iov[1].iov_base = buf;
rdata->iov[1].iov_len =
- min_t(unsigned int, buf_len, server->vals->read_rsp_size) - 4;
+ min_t(unsigned int, buf_len, server->vals->read_rsp_size);
cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
rdata->iov[0].iov_base, rdata->iov[0].iov_len);
cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
--
2.20.1
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