[PATCH 6.6 037/102] cifs: update the same create_guid on replay

Greg Kroah-Hartman
2024-05-23T13:24:02Z

From: Steve French <stfrench@microsoft.com>

[ Upstream commit 79520587fe42cd4988aff8695d60621e689109cb ]

File open requests made to the server contain a
CreateGuid, which is used by the server to identify
the open request. If the same request needs to be
replayed, it needs to be sent with the same CreateGuid
in the durable handle v2 context.

Without doing so, we could end up leaking handles on
the server when:
1. multichannel is used AND
2. connection goes down, but not for all channels

This is because the replayed open request would have a
new CreateGuid and the server will treat this as a new
request and open a new handle.

This change fixes this by reusing the existing create_guid
stored in the cached fid struct.

REF: MS-SMB2 4.9 Replay Create Request on an Alternate Channel

Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set")
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/smb/client/cached_dir.c | 1 +
fs/smb/client/cifsglob.h | 1 +
fs/smb/client/smb2ops.c | 4 ++++
fs/smb/client/smb2pdu.c | 10 ++++++++--
4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/fs/smb/client/cached_dir.c b/fs/smb/client/cached_dir.c
index ca0fd25236ef4..0ff2491c311d8 100644
--- a/fs/smb/client/cached_dir.c
+++ b/fs/smb/client/cached_dir.c
@@ -243,6 +243,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
FILE_READ_EA,
.disposition = FILE_OPEN,
.fid = pfid,
+ .replay = !!(retries),
};

rc = SMB2_open_init(tcon, server,
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 8fbdb781d70a6..181e9d5b10f92 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -1382,6 +1382,7 @@ struct cifs_open_parms {
struct cifs_fid *fid;
umode_t mode;
bool reconnect:1;
+ bool replay:1; /* indicates that this open is for a replay */
};

struct cifs_fid {
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 06735c5685bf6..23cf6e92fd54c 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -1204,6 +1204,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
+ .replay = !!(retries),
};

rc = SMB2_open_init(tcon, server,
@@ -1570,6 +1571,7 @@ smb2_ioctl_query_info(const unsigned int xid,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, create_options),
.fid = &fid,
+ .replay = !!(retries),
};

if (qi.flags & PASSTHRU_FSCTL) {
@@ -2296,6 +2298,7 @@ smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = fid,
+ .replay = !!(retries),
};

rc = SMB2_open_init(tcon, server,
@@ -2684,6 +2687,7 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
.disposition = FILE_OPEN,
.create_options = cifs_create_options(cifs_sb, 0),
.fid = &fid,
+ .replay = !!(retries),
};

rc = SMB2_open_init(tcon, server,
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index c73a621a8b83e..60793143e24c6 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -2421,8 +2421,13 @@ create_durable_v2_buf(struct cifs_open_parms *oparms)
*/
buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
- generate_random_uuid(buf->dcontext.CreateGuid);
- memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
+
+ /* for replay, we should not overwrite the existing create guid */
+ if (!oparms->replay) {
+ generate_random_uuid(buf->dcontext.CreateGuid);
+ memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
+ } else
+ memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);

/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
buf->Name[0] = 'D';
@@ -3159,6 +3164,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
/* reinitialize for possible replay */
flags = 0;
server = cifs_pick_channel(ses);
+ oparms->replay = !!(retries);

cifs_dbg(FYI, "create/open\n");
if (!ses || !server)
--
2.43.0