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smb: client: increase number of PDUs allowed in a compound request

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With the introduction of SMB2_OP_QUERY_WSL_EA, the client may now send
5 commands in a single compound request in order to query xattrs from
potential WSL reparse points, which should be fine as we currently
allow up to 5 PDUs in a single compound request.  However, if
encryption is enabled (e.g. 'seal' mount option) or enforced by the
server, current MAX_COMPOUND(5) won't be enough as we require an extra
PDU for the transform header.

Fix this by increasing MAX_COMPOUND to 7 and, while we're at it, add
an WARN_ON_ONCE() and return -EIO instead of -ENOMEM in case we
attempt to send a compound request that couldn't include the extra
transform header.

Signed-off-by: Paulo Alcantara <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2024-01-29 21:04:44 -03:00 committed by Steve French
parent 6aac002bcf
commit 11d4d1dba3
2 changed files with 3 additions and 3 deletions
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2
fs/smb/client/cifsglob.h
View file

@ -87,7 +87,7 @@
#define SMB_INTERFACE_POLL_INTERVAL 600
/* maximum number of PDUs in one compound */
#define MAX_COMPOUND 5
#define MAX_COMPOUND 7
/*
* Default number of credits to keep available for SMB3.

4
fs/smb/client/transport.c
View file

@ -435,8 +435,8 @@ smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
if (!(flags & CIFS_TRANSFORM_REQ))
return __smb_send_rqst(server, num_rqst, rqst);
if (num_rqst > MAX_COMPOUND - 1)
return -ENOMEM;
if (WARN_ON_ONCE(num_rqst > MAX_COMPOUND - 1))
return -EIO;
if (!server->ops->init_transform_rq) {
cifs_server_dbg(VFS, "Encryption requested but transform callback is missing\n");