[ Upstream commit 158a66b245739e15858de42c0ba60fcf3de9b8e6 ]
The SMB2 Write packet contains data that is to be written to a file or to a pipe. Depending on the client, there may be padding between the header and the data field. Currently, the length is validated only in the case padding is present.
Since the DataOffset field always points to the beginning of the data, there is no need to have a special case for padding. By removing this, the length is validated in both cases.
Signed-off-by: Marios Makassikis mmakassikis@freebox.fr Acked-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Namjae Jeon linkinjeon@kernel.org --- fs/ksmbd/smb2pdu.c | 42 ++++++++++++++++-------------------------- 1 file changed, 16 insertions(+), 26 deletions(-)
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index a1bcb822c95d..134a725332a0 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -6410,23 +6410,18 @@ static noinline int smb2_write_pipe(struct ksmbd_work *work) length = le32_to_cpu(req->Length); id = req->VolatileFileId;
- if (le16_to_cpu(req->DataOffset) == - offsetof(struct smb2_write_req, Buffer)) { - data_buf = (char *)&req->Buffer[0]; - } else { - if ((u64)le16_to_cpu(req->DataOffset) + length > - get_rfc1002_len(work->request_buf)) { - pr_err("invalid write data offset %u, smb_len %u\n", - le16_to_cpu(req->DataOffset), - get_rfc1002_len(work->request_buf)); - err = -EINVAL; - goto out; - } - - data_buf = (char *)(((char *)&req->hdr.ProtocolId) + - le16_to_cpu(req->DataOffset)); + if ((u64)le16_to_cpu(req->DataOffset) + length > + get_rfc1002_len(work->request_buf)) { + pr_err("invalid write data offset %u, smb_len %u\n", + le16_to_cpu(req->DataOffset), + get_rfc1002_len(work->request_buf)); + err = -EINVAL; + goto out; }
+ data_buf = (char *)(((char *)&req->hdr.ProtocolId) + + le16_to_cpu(req->DataOffset)); + rpc_resp = ksmbd_rpc_write(work->sess, id, data_buf, length); if (rpc_resp) { if (rpc_resp->flags == KSMBD_RPC_ENOTIMPLEMENTED) { @@ -6571,20 +6566,15 @@ int smb2_write(struct ksmbd_work *work)
if (req->Channel != SMB2_CHANNEL_RDMA_V1 && req->Channel != SMB2_CHANNEL_RDMA_V1_INVALIDATE) { - if (le16_to_cpu(req->DataOffset) == + if (le16_to_cpu(req->DataOffset) < offsetof(struct smb2_write_req, Buffer)) { - data_buf = (char *)&req->Buffer[0]; - } else { - if (le16_to_cpu(req->DataOffset) < - offsetof(struct smb2_write_req, Buffer)) { - err = -EINVAL; - goto out; - } - - data_buf = (char *)(((char *)&req->hdr.ProtocolId) + - le16_to_cpu(req->DataOffset)); + err = -EINVAL; + goto out; }
+ data_buf = (char *)(((char *)&req->hdr.ProtocolId) + + le16_to_cpu(req->DataOffset)); + ksmbd_debug(SMB, "flags %u\n", le32_to_cpu(req->Flags)); if (le32_to_cpu(req->Flags) & SMB2_WRITEFLAG_WRITE_THROUGH) writethrough = true;