diff options
Diffstat (limited to 'fs/smb/server/smb_common.c')
| -rw-r--r-- | fs/smb/server/smb_common.c | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/fs/smb/server/smb_common.c b/fs/smb/server/smb_common.c index adc41b57b84c..e90a1e8c1951 100644 --- a/fs/smb/server/smb_common.c +++ b/fs/smb/server/smb_common.c @@ -158,8 +158,12 @@ int ksmbd_verify_smb_message(struct ksmbd_work *work) */ bool ksmbd_smb_request(struct ksmbd_conn *conn) { - __le32 *proto = (__le32 *)smb2_get_msg(conn->request_buf); + __le32 *proto; + if (conn->request_buf[0] != 0) + return false; + + proto = (__le32 *)smb2_get_msg(conn->request_buf); if (*proto == SMB2_COMPRESSION_TRANSFORM_ID) { pr_err_ratelimited("smb2 compression not support yet"); return false; @@ -266,7 +270,7 @@ static int ksmbd_negotiate_smb_dialect(void *buf) if (smb2_neg_size > smb_buf_length) goto err_out; - if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) > + if (struct_size(req, Dialects, le16_to_cpu(req->DialectCount)) > smb_buf_length) goto err_out; @@ -319,12 +323,6 @@ static int init_smb1_rsp_hdr(struct ksmbd_work *work) struct smb_hdr *rsp_hdr = (struct smb_hdr *)work->response_buf; struct smb_hdr *rcv_hdr = (struct smb_hdr *)work->request_buf; - /* - * Remove 4 byte direct TCP header. - */ - *(__be32 *)work->response_buf = - cpu_to_be32(sizeof(struct smb_hdr) - 4); - rsp_hdr->Command = SMB_COM_NEGOTIATE; *(__le32 *)rsp_hdr->Protocol = SMB1_PROTO_NUMBER; rsp_hdr->Flags = SMBFLG_RESPONSE; @@ -359,8 +357,8 @@ static int smb1_check_user_session(struct ksmbd_work *work) */ static int smb1_allocate_rsp_buf(struct ksmbd_work *work) { - work->response_buf = kmalloc(MAX_CIFS_SMALL_BUFFER_SIZE, - GFP_KERNEL | __GFP_ZERO); + work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, + GFP_KERNEL); work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE; if (!work->response_buf) { @@ -571,10 +569,11 @@ static int smb_handle_negotiate(struct ksmbd_work *work) ksmbd_debug(SMB, "Unsupported SMB1 protocol\n"); - /* Add 2 byte bcc and 2 byte DialectIndex. */ - inc_rfc1001_len(work->response_buf, 4); - neg_rsp->hdr.Status.CifsError = STATUS_SUCCESS; + if (ksmbd_iov_pin_rsp(work, (void *)neg_rsp, + sizeof(struct smb_negotiate_rsp) - 4)) + return -ENOMEM; + neg_rsp->hdr.Status.CifsError = STATUS_SUCCESS; neg_rsp->hdr.WordCount = 1; neg_rsp->DialectIndex = cpu_to_le16(work->conn->dialect); neg_rsp->ByteCount = 0; |