scsi: be2iscsi: Check size before copying ASYNC handle

Data in buffers are gathered into a single buffer before giving to iSCSI
layer. Though less likely to have payload more than 8K in ASYNC PDU, the
data length is provide by FW and check is missing for overrun.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/be2iscsi/be_main.c

@@ -1611,6 +1611,10 @@ beiscsi_hdl_fwd_pdu(struct beiscsi_conn *beiscsi_conn,
 			dlen = pasync_handle->buffer_len;
 			continue;
 		}
+		if (!pasync_handle->buffer_len ||
+		    (dlen + pasync_handle->buffer_len) >
+		    pasync_ctx->async_data.buffer_size)
+			break;
 		memcpy(pdata + dlen, pasync_handle->pbuffer,
 		       pasync_handle->buffer_len);
 		dlen += pasync_handle->buffer_len;
@@ -1619,8 +1623,9 @@ beiscsi_hdl_fwd_pdu(struct beiscsi_conn *beiscsi_conn,
 	if (!plast_handle->is_final) {
 		/* last handle should have final PDU notification from FW */
 		beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_ISCSI,
-			    "BM_%d : cid %u %p fwd async PDU with last handle missing - HL%u:DN%u:DR%u\n",
+			    "BM_%d : cid %u %p fwd async PDU opcode %x with last handle missing - HL%u:DN%u:DR%u\n",
 			    beiscsi_conn->beiscsi_conn_cid, plast_handle,
+			    AMAP_GET_BITS(struct amap_pdu_base, opcode, phdr),
 			    pasync_ctx->async_entry[cri].wq.hdr_len,
 			    pasync_ctx->async_entry[cri].wq.bytes_needed,
 			    pasync_ctx->async_entry[cri].wq.bytes_received);