diff options
Diffstat (limited to 'fs/smb/server/connection.c')
| -rw-r--r-- | fs/smb/server/connection.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/fs/smb/server/connection.c b/fs/smb/server/connection.c index 4882a812ea86..2a717d158f02 100644 --- a/fs/smb/server/connection.c +++ b/fs/smb/server/connection.c @@ -294,6 +294,9 @@ bool ksmbd_conn_alive(struct ksmbd_conn *conn) return true; } +#define SMB1_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb_hdr)) +#define SMB2_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb2_hdr) + 4) + /** * ksmbd_conn_handler_loop() - session thread to listen on new smb requests * @p: connection instance @@ -350,6 +353,9 @@ int ksmbd_conn_handler_loop(void *p) if (pdu_size > MAX_STREAM_PROT_LEN) break; + if (pdu_size < SMB1_MIN_SUPPORTED_HEADER_SIZE) + break; + /* 4 for rfc1002 length field */ /* 1 for implied bcc[0] */ size = pdu_size + 4 + 1; @@ -358,8 +364,6 @@ int ksmbd_conn_handler_loop(void *p) break; memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf)); - if (!ksmbd_smb_request(conn)) - break; /* * We already read 4 bytes to find out PDU size, now @@ -377,6 +381,15 @@ int ksmbd_conn_handler_loop(void *p) continue; } + if (!ksmbd_smb_request(conn)) + break; + + if (((struct smb2_hdr *)smb2_get_msg(conn->request_buf))->ProtocolId == + SMB2_PROTO_NUMBER) { + if (pdu_size < SMB2_MIN_SUPPORTED_HEADER_SIZE) + break; + } + if (!default_conn_ops.process_fn) { pr_err("No connection request callback\n"); break; |